I created a script that searched through the files of SMF (2 for right now) that grabs all of the keys from variables. It only works for $var['{KEY}']. I should come up with a better way to document it.
allow_disableAnnounce
0 => Post.php
1 => Profile.template.php
allow_editDisplayName
0 => Profile.php
1 => Register.php
allow_guestAccess
0 => LogInOut.php
1 => index.php
allow_hideOnline
0 => Profile.php
allow_hide_email
0 => Display.php
1 => Groups.php
2 => Load.php
3 => Memberlist.php
4 => News.php
5 => PersonalMessage.php
6 => Profile.php
7 => Register.php
8 => Search.php
9 => Subs-Auth.php
10 => Subs-Members.php
allow_ignore_boards
0 => Load.php
1 => Profile.php
allow_sm_stats
0 => Stats.php
approveAccountDeletion
0 => Profile.php
attachmentCheckExtensions
0 => Post.php
1 => Subs-Post.php
2 => Post.template.php
attachmentDirSizeLimit
0 => ManageAttachments.php
1 => Post.php
2 => Subs-Post.php
attachmentEnable
0 => Display.php
1 => Post.php
attachmentEncryptFilenames
0 => Subs-Post.php
1 => Subs.php
attachmentExtensions
0 => Post.php
1 => Subs-Post.php
attachmentNumPerPostLimit
0 => Post.php
1 => Post.template.php
attachmentPostLimit
0 => Post.php
attachmentShowImages
0 => Display.php
attachmentSizeLimit
0 => Post.php
1 => Subs-Post.php
2 => Post.template.php
attachmentThumbHeight
0 => Display.php
1 => Subs-Post.php
attachmentThumbWidth
0 => Display.php
1 => Subs-Post.php
attachmentThumbnails
0 => Display.php
1 => Subs-Post.php
attachmentUploadDir
0 => Display.php
1 => ManageAttachments.php
2 => Post.php
3 => Profile.php
4 => Subs-Graphics.php
5 => Subs-Package.php
6 => Subs-Post.php
7 => Subs.php
autoFixDatabase
0 => Database.php
1 => Subs-Db-mysql.php
2 => Subs-Db-postgresql.php
3 => Subs-Db-sqlite.php
autoLinkUrls
0 => Subs.php
autoOptMaxOnline
0 => ScheduledTasks.php
avatar_action_too_large
0 => Load.php
1 => Profile.php
2 => Subs.php
avatar_directory
0 => ManageAttachments.php
1 => Profile.php
2 => Subs-Package.php
avatar_download_external
0 => Profile.php
avatar_download_png
0 => Subs-Graphics.php
avatar_max_height_external
0 => Load.php
1 => Profile.php
2 => Subs.php
3 => Profile.template.php
avatar_max_height_upload
0 => Profile.php
avatar_max_width_external
0 => Load.php
1 => Profile.php
2 => Subs.php
3 => Profile.template.php
avatar_max_width_upload
0 => Profile.php
avatar_resize_upload
0 => Profile.php
avatar_url
0 => Load.php
1 => Profile.php
2 => Subs.php
3 => Profile.template.php
banLastUpdated
0 => Security.php
bbc_disabled_disabledBBC
0 => ManagePosts.php
bbc_disabled_signature_bbc
0 => ModSettings.php
cache_enable
0 => Database.php
1 => Load.php
2 => MoveTopic.php
3 => News.php
4 => Search.php
5 => Subs-Auth.php
6 => Subs-Db-mysql.php
7 => Subs-Db-postgresql.php
8 => Subs-Db-sqlite.php
9 => Subs.php
cache_memcached
0 => Load.php
cal_allow_unlinked
0 => Calendar.php
cal_allowspan
0 => Calendar.php
1 => Post.php
2 => Subs-Calendar.php
3 => Post.template.php
4 => Calendar.template.php
cal_days_for_index
0 => SSI.php
1 => BoardIndex.php
cal_daysaslink
0 => Calendar.template.php
cal_defaultboard
0 => Calendar.php
1 => Post.php
cal_enabled
0 => BoardIndex.php
1 => Calendar.php
2 => Display.php
3 => ManageCalendar.php
4 => Subs.php
cal_maxspan
0 => Calendar.php
1 => Post.php
2 => Subs-Calendar.php
3 => Post.template.php
4 => Calendar.template.php
cal_maxyear
0 => Calendar.php
1 => Post.php
2 => Subs-Calendar.php
3 => Post.template.php
4 => Calendar.template.php
5 => ManageCalendar.template.php
cal_minyear
0 => Calendar.php
1 => Post.php
2 => Subs-Calendar.php
3 => Post.template.php
4 => Calendar.template.php
5 => ManageCalendar.template.php
cal_showInTopic
0 => Display.php
cal_showbdays
0 => BoardIndex.php
1 => Calendar.php
cal_showevents
0 => BoardIndex.php
1 => Calendar.php
cal_showholidays
0 => BoardIndex.php
1 => Calendar.php
cal_showweeknum
0 => Calendar.php
censorIgnoreCase
0 => Load.php
1 => Admin.template.php
censorWholeWord
0 => Load.php
1 => Admin.template.php
censor_proper
0 => Load.php
1 => ManagePosts.php
censor_vulgar
0 => Load.php
1 => ManagePosts.php
compactTopicPagesContiguous
0 => Subs.php
compactTopicPagesEnable
0 => Display.php
1 => Subs.php
cookieTime
0 => LogInOut.php
1 => ManageServer.php
2 => Profile.php
3 => Register.php
4 => BoardIndex.template.php
5 => Login.template.php
coppaAge
0 => Register.php
1 => Register.template.php
coppaFax
0 => Register.php
1 => Register.template.php
coppaPhone
0 => Register.php
1 => Register.template.php
coppaPost
0 => ManageRegistration.php
1 => Register.php
coppaType
0 => Register.php
1 => Register.template.php
copy_settings
0 => Admin.php
copyright_key
0 => Admin.php
1 => Subs.php
countChildPosts
0 => BoardIndex.php
1 => MessageIndex.php
custom_avatar_dir
0 => ManageAttachments.php
1 => Profile.php
2 => Subs-Graphics.php
3 => Subs-Package.php
custom_avatar_enabled
0 => ManageAttachments.php
1 => Profile.php
2 => Subs-Graphics.php
custom_avatar_url
0 => Load.php
1 => Profile.php
2 => Subs.php
databaseSession_enable
0 => Load.php
databaseSession_lifetime
0 => Load.php
databaseSession_loose
0 => Load.php
defaultMaxMembers
0 => Groups.php
1 => Load.php
2 => ManageMembers.php
3 => Memberlist.php
4 => Who.php
defaultMaxMessages
0 => Display.php
1 => Load.php
2 => ManageAttachments.php
3 => ManageBans.php
4 => ManageErrors.php
5 => MessageIndex.php
6 => ModerationCenter.php
7 => PersonalMessage.php
8 => Profile.php
9 => Recent.php
10 => SplitTopics.php
11 => index.php
defaultMaxTopics
0 => Load.php
1 => MessageIndex.php
2 => Recent.php
3 => SplitTopics.php
4 => index.php
default_personal_text
0 => Subs-Members.php
default_timezone
0 => Load.php
1 => install.php
deleted
0 => Boardnation.php
disableCheckUA
0 => Load.php
1 => Security.php
disableEntityCheck
0 => Load.php
disableHashTime
0 => Subs.php
disableHostnameLookup
0 => ManageBans.php
1 => Profile.php
2 => Security.php
3 => ManageBans.template.php
disableQueryCheck
0 => Database.php
1 => Subs-Db-mysql.php
2 => Subs-Db-postgresql.php
3 => install.php
disableRegisterCheck
0 => Subs-Members.php
disableTemplateEval
0 => Load.php
disable_log_report
0 => SendTopic.php
disable_smf_js
0 => Admin.template.php
1 => ManageSmileys.template.php
2 => Packages.template.php
3 => Themes.template.php
disable_wysiwyg
0 => Subs-Post.php
1 => Post.template.php
2 => Profile.template.php
disabledBBC
0 => ManagePosts.php
1 => Subs-Post.php
2 => Subs.php
disabled_profile_fields
0 => Display.php
1 => Memberlist.php
2 => ModSettings.php
3 => Profile.php
disallow_sendBody
0 => Post.php
1 => Subs-Post.php
2 => Profile.template.php
displayFields
0 => Display.template.php
edit_disable_time
0 => Display.php
1 => Post.php
2 => Profile.php
3 => Recent.php
4 => RemoveTopic.php
edit_wait_time
0 => Post.php
email
0 => Constants.php
1 => Boardnation.php
enableAllMessages
0 => Display.php
1 => MessageIndex.php
2 => Recent.php
enableBBC
0 => Subs-Post.php
1 => Subs.php
enableCompressedOutput
0 => SSI.php
1 => Admin.php
2 => Display.php
3 => DumpDatabase.php
4 => Load.php
5 => News.php
6 => index.php
enableEmbeddedFlash
0 => Subs.php
enableErrorLogging
0 => Errors.php
1 => changelog.txt
enableParticipation
0 => MessageIndex.php
1 => Recent.php
2 => Search.php
3 => MessageIndex.template.php
4 => Recent.template.php
enablePostHTML
0 => Subs.php
enablePreviousNext
0 => Display.php
enableReportPM
0 => PersonalMessage.php
1 => PersonalMessage.template.php
enableSpellChecking
0 => Display.php
1 => PersonalMessage.php
2 => Post.php
3 => Profile.php
4 => Search.php
enableStickyTopics
0 => Display.php
1 => LockTopic.php
2 => MessageIndex.php
3 => Post.php
4 => Recent.php
5 => Search.php
6 => SplitTopics.php
7 => MessageIndex.template.php
8 => Recent.template.php
9 => Admin.template.php
enableVBStyleLogin
0 => BoardIndex.php
1 => Subs.php
enable_buddylist
0 => Load.php
1 => Profile.php
2 => Subs-Post.php
3 => PersonalMessage.template.php
failed_login_threshold
0 => LogInOut.php
fixLongWords
0 => Subs.php
forum_alias_urls
0 => Load.php
1 => Subs-Auth.php
gadmin
0 => Boardnation.php
1 => Load.php
gadmin_subdomain
0 => Boardnation.php
globalCookies
0 => Load.php
1 => Security.php
2 => Subs-Auth.php
global_character_set
0 => Load.php
1 => ManageMaintenance.php
2 => ScheduledTasks.php
3 => Subs.php
guest_hideContacts
0 => Display.php
1 => Load.php
2 => Memberlist.php
3 => News.php
guest_post_no_email
0 => Post.php
1 => Post.template.php
2 => Wireless.template.php
hitStats
0 => Stats.template.php
1 => Xml.template.php
2 => index.php
host_to_dis
0 => Subs.php
hotTopicPosts
0 => Display.php
1 => MessageIndex.php
2 => Recent.php
3 => Search.php
4 => MessageIndex.template.php
5 => Recent.template.php
hotTopicVeryPosts
0 => Display.php
1 => MessageIndex.php
2 => Recent.php
3 => Search.php
4 => MessageIndex.template.php
5 => Recent.template.php
integrate_activate
0 => ManageMembers.php
1 => Profile.php
2 => Register.php
integrate_buffer
0 => Subs.php
integrate_change_member_data
0 => Subs.php
integrate_delete_member
0 => Subs-Members.php
integrate_egg_nog
0 => ViewQuery.php
integrate_exit
0 => Subs.php
integrate_fix_url
0 => News.php
integrate_login
0 => LogInOut.php
integrate_logout
0 => LogInOut.php
integrate_magic_quotes
0 => QueryString.php
integrate_outgoing_email
0 => Subs-Post.php
integrate_personal_message
0 => Subs-Post.php
integrate_pre_include
0 => Load.php
integrate_pre_load
0 => Load.php
integrate_redirect
0 => Subs.php
integrate_register
0 => Subs-Members.php
integrate_reset_pass
0 => Profile.php
1 => Reminder.php
2 => Subs-Auth.php
integrate_validate_login
0 => LogInOut.php
integrate_verify_password
0 => Profile.php
1 => Security.php
integrate_verify_user
0 => Load.php
integrate_whos_online
0 => Who.php
karmaApplaudLabel
0 => Display.template.php
1 => PersonalMessage.template.php
2 => Profile.template.php
karmaLabel
0 => Display.template.php
1 => PersonalMessage.template.php
2 => Profile.template.php
karmaMinPosts
0 => Karma.php
1 => Load.php
karmaMode
0 => Karma.php
1 => Load.php
2 => News.php
3 => Profile.php
4 => Display.template.php
5 => PersonalMessage.template.php
6 => Profile.template.php
karmaSmiteLabel
0 => Display.template.php
1 => PersonalMessage.template.php
2 => Profile.template.php
karmaTimeRestrictAdmins
0 => Karma.php
karmaWaitTime
0 => Karma.php
knownThemes
0 => Load.php
1 => Packages.php
2 => Profile.php
3 => Themes.php
language
0 => Boardnation.php
lastActive
0 => Subs.php
1 => BoardIndex.template.php
last_mod_report_action
0 => Security.php
latestMember
0 => Boardnation.php
1 => ManageNews.php
2 => Post.php
3 => Profile.php
4 => Subs.php
latestRealName
0 => Boardnation.php
1 => ManageNews.php
2 => Subs.php
load_average
0 => Load.php
1 => ScheduledTasks.php
loadavg_allunread
0 => Recent.php
loadavg_auto_opt
0 => ScheduledTasks.php
loadavg_enable
0 => Load.php
loadavg_forum
0 => Load.php
loadavg_search
0 => PersonalMessage.php
1 => Search.php
loadavg_show_posts
0 => Profile.php
loadavg_unreadreplies
0 => Recent.php
localCookies
0 => Security.php
1 => Subs-Auth.php
mail_from
0 => Subs-Post.php
mail_limit
0 => ScheduledTasks.php
1 => Subs-Post.php
mail_next_send
0 => Load.php
1 => ScheduledTasks.php
mail_no_message_id
0 => Subs-Post.php
mail_quantity
0 => ScheduledTasks.php
mail_queue
0 => ManageNews.php
1 => Post.php
2 => Subs-Post.php
mail_recent
0 => ScheduledTasks.php
1 => Subs-Post.php
mail_strip_carriage
0 => ScheduledTasks.php
1 => Subs-Post.php
mail_type
0 => ScheduledTasks.php
1 => Subs-Post.php
maxMsgID
0 => SSI.php
1 => Display.php
2 => Load.php
3 => ManageMaintenance.php
4 => MessageIndex.php
5 => MoveTopic.php
6 => News.php
7 => Recent.php
8 => RemoveTopic.php
9 => Search.php
10 => SplitTopics.php
11 => Subs-BoardIndex.php
12 => Subs-Boards.php
13 => Subs-Post.php
14 => Subs-Recent.php
max_image_height
0 => Display.php
1 => Subs-Post.php
2 => Subs.php
max_image_width
0 => Display.php
1 => Subs-Post.php
2 => Subs.php
max_messageLength
0 => ManagePosts.php
1 => PersonalMessage.php
2 => Post.php
max_pm_recipients
0 => ModSettings.php
1 => PersonalMessage.php
memberCount
0 => Load.php
1 => changelog.txt
memberlist_cache
0 => Memberlist.php
memberlist_updated
0 => Memberlist.php
messageIconChecks_disable
0 => SSI.php
1 => Display.php
2 => MessageIndex.php
3 => Recent.php
4 => Search.php
messageIcons_enable
0 => ManageSmileys.php
1 => Subs-Editor.php
modlog_enabled
0 => Subs.php
mostDate
0 => Stats.php
1 => BoardIndex.template.php
mostOnline
0 => Stats.php
1 => Subs-MembersOnline.php
2 => BoardIndex.template.php
mostOnlineToday
0 => Subs-MembersOnline.php
1 => BoardIndex.template.php
mostOnlineUpdated
0 => Subs-MembersOnline.php
new_avatar_data
0 => Profile.php
1 => Subs-Graphics.php
news
0 => ManageNews.php
1 => Subs.php
next_task_time
0 => Load.php
1 => ScheduledTasks.php
notify_new_registration
0 => Subs-Post.php
1 => Register.template.php
number_format
0 => Load.php
oldTopicDays
0 => Post.php
onlineEnable
0 => Display.template.php
1 => PersonalMessage.template.php
package_disable_cache
0 => Subs-Package.php
package_make_backups
0 => Packages.php
1 => Subs-Package.php
package_path
0 => Subs-Package.php
package_port
0 => PackageGet.php
1 => Packages.php
2 => Subs-Package.php
package_server
0 => PackageGet.php
1 => Packages.php
2 => Subs-Package.php
package_username
0 => PackageGet.php
1 => Packages.php
2 => Subs-Package.php
password_strength
0 => Subs-Auth.php
1 => Register.template.php
2 => Reminder.template.php
3 => Errors.english.php
permission_enable_deny
0 => Load.php
1 => ManagePermissions.php
2 => Reports.php
3 => ManagePermissions.template.php
permission_enable_postgroups
0 => ManageMembergroups.php
1 => ManageNews.php
2 => ManagePermissions.php
3 => Reports.php
4 => ManageMembergroups.template.php
plan
0 => Boardnation.php
plan_actions
0 => Boardnation.php
1 => index.php
plan_perms
0 => Boardnation.php
pm_posts_per_hour
0 => ModSettings.php
1 => PersonalMessage.php
pm_posts_verification
0 => ModSettings.php
1 => PersonalMessage.php
pm_spam_settings
0 => ModSettings.php
1 => PersonalMessage.php
pollMode
0 => Display.php
1 => MessageIndex.php
2 => Post.php
3 => Recent.php
4 => Search.php
5 => MessageIndex.template.php
6 => Recent.template.php
posts_require_captcha
0 => Post.php
queryless_urls
0 => News.php
1 => QueryString.php
2 => Subs.php
recycle_board
0 => SSI.php
1 => News.php
2 => Profile.php
3 => Recent.php
4 => RemoveTopic.php
5 => Search.php
6 => Stats.php
7 => Subs-BoardIndex.php
8 => Subs-Recent.php
9 => Subs.php
10 => ManageBoards.template.php
recycle_enable
0 => SSI.php
1 => News.php
2 => Profile.php
3 => Recent.php
4 => RemoveTopic.php
5 => Search.php
6 => Stats.php
7 => Subs-BoardIndex.php
8 => Subs-Recent.php
9 => Subs.php
10 => ManageBoards.template.php
registration_fields
0 => ModSettings.php
1 => Register.php
registration_method
0 => ManageMembers.php
1 => Register.php
2 => Subs.php
3 => Register.template.php
removeNestedQuotes
0 => PersonalMessage.php
1 => Post.php
requireAgreement
0 => ManageRegistration.php
1 => Register.php
reserveCase
0 => ManageRegistration.php
1 => Subs-Members.php
reserveName
0 => ManageRegistration.php
1 => Subs-Members.php
reserveNames
0 => ManageRegistration.php
1 => Subs-Members.php
reserveUser
0 => ManageRegistration.php
1 => Subs-Members.php
reserveWord
0 => ManageRegistration.php
1 => Subs-Members.php
search_banned_words
0 => Search.php
search_custom_index_config
0 => ManageSearch.php
1 => RemoveTopic.php
2 => Search.php
3 => Subs-Post.php
search_custom_index_resume
0 => ManageSearch.php
search_force_index
0 => Search.php
1 => ManageSearch.template.php
search_index
0 => ManageSearch.php
1 => Search.php
2 => ManageSearch.template.php
search_match_words
0 => Search.php
1 => ManageSearch.template.php
search_max_cached_results
0 => changelog.txt
search_max_results
0 => Search.php
search_method
0 => Search.php
search_pointer
0 => Search.php
search_results_per_page
0 => PersonalMessage.php
1 => Search.php
search_simple_fulltext
0 => Search.php
1 => Search.template.php
search_stopwords
0 => ManageSearch.php
1 => Search.php
2 => Subs-Post.php
search_weight_age
0 => ManageSearch.template.php
search_weight_first_message
0 => ManageSearch.template.php
search_weight_frequency
0 => ManageSearch.template.php
search_weight_length
0 => ManageSearch.template.php
search_weight_sticky
0 => ManageSearch.template.php
search_weight_subject
0 => ManageSearch.template.php
securityDisable
0 => Security.php
send_welcomeEmail
0 => Register.php
1 => Register.template.php
settings_updated
0 => Load.php
1 => Security.php
show_group_membership
0 => ManageMembergroups.php
1 => Profile.php
showsidebarAdmin
0 => Admin.php
1 => ModerationCenter.php
signature_settings
0 => Display.php
1 => ModSettings.php
2 => PersonalMessage.php
3 => Profile.php
simpleSearch
0 => PersonalMessage.php
1 => Search.php
smfVersion
0 => Database.php
1 => Stats.php
2 => Subs-Db-mysql.php
3 => Subs-Db-postgresql.php
4 => Subs-Db-sqlite.php
smiley_enable
0 => ManageSmileys.php
1 => Subs-Editor.php
2 => Subs-Post.php
3 => Subs.php
4 => ManageSmileys.template.php
smiley_sets_default
0 => Load.php
1 => ManageSmileys.php
2 => ManageSmileys.template.php
3 => Profile.template.php
smiley_sets_enable
0 => Load.php
1 => Profile.php
smiley_sets_known
0 => Load.php
1 => ManageSmileys.php
2 => Themes.php
smiley_sets_names
0 => ManageSmileys.php
1 => Themes.php
smileys_dir
0 => ManageSmileys.php
1 => Subs-Package.php
smileys_url
0 => Load.php
1 => ManageSmileys.php
2 => Subs-Editor.php
3 => Subs-Post.php
4 => Subs.php
5 => Help.template.php
6 => ManageSmileys.template.php
7 => Profile.template.php
smtp_host
0 => ScheduledTasks.php
1 => Subs-Post.php
smtp_password
0 => Subs-Post.php
smtp_port
0 => Subs-Post.php
smtp_username
0 => Subs-Post.php
spamWaitTime
0 => Subs.php
theme_allow
0 => Load.php
1 => Profile.php
2 => Themes.php
3 => Themes.template.php
theme_guests
0 => Load.php
1 => Themes.php
2 => Themes.template.php
timeLoadPageEnable
0 => Subs.php
time_format
0 => Load.php
1 => ManageNews.php
2 => ScheduledTasks.php
time_offset
0 => SSI.php
1 => BoardIndex.php
2 => Profile.php
3 => Subs.php
titlesEnable
0 => Load.php
1 => Profile.php
2 => Profile.template.php
todayMod
0 => Subs.php
topbottomEnable
0 => Display.template.php
1 => MessageIndex.template.php
topicSummaryPosts
0 => Post.php
totalMembers
0 => SSI.php
1 => Load.php
2 => Memberlist.php
3 => Stats.php
4 => Subs-Members.php
5 => Subs.php
totalMessages
0 => SSI.php
1 => ManageSearch.php
2 => News.php
3 => Profile.php
4 => Recent.php
5 => Stats.php
6 => Subs.php
totalTopics
0 => SSI.php
1 => Profile.php
2 => Stats.php
3 => Subs.php
trackStats
0 => BoardIndex.php
1 => Subs.php
unapprovedMembers
0 => LogInOut.php
1 => ManageMembers.php
2 => Profile.php
3 => Subs.php
userLanguage
0 => Load.php
1 => ManageMembers.php
2 => PersonalMessage.php
3 => Post.php
4 => Profile.php
5 => Register.php
6 => SendTopic.php
7 => Subs-Post.php
8 => Profile.template.php
user_limit
0 => ModSettings.php
1 => Profile.php
visual_verification_type
0 => ManageRegistration.php
1 => Register.php
2 => Subs-Graphics.php
3 => Register.template.php
warn_enabled
0 => ModerationCenter.php
warning_enable
0 => ModSettings.php
1 => Profile.php
warning_moderate
0 => Profile.php
1 => Security.php
2 => Profile.template.php
warning_mute
0 => Profile.php
1 => Security.php
2 => Profile.template.php
warning_settings
0 => ModSettings.php
1 => ModerationCenter.php
2 => Profile.php
warning_watch
0 => ModSettings.php
1 => ModerationCenter.php
2 => Profile.php
3 => Profile.template.php
who_enabled
0 => BoardIndex.php
1 => Profile.php
2 => Subs.php
3 => Who.php
xmlnews_enable
0 => News.php
1 => index.template.php
xmlnews_maxlen
0 => News.php
