$RCLinesMax, which can be used to limit the total number of lines in Recent Changes files.
$EnableDirectDownload (PITS:00109).
$EnableFixedUrlRedirect (requested by Monty and Fred Chittenden).
$LinkWikiWords = 0.
(:attachlist:) to limit output to selected extensions (PITS:00389, requested by corqspy).
(:attachlist:) to request listing of attachments for a page other than the current one.
$MetaRobots (PITS:00393, noticed by Didier Lebrun).
{$FullName} markup.
$EnablePageListProtect -- when set to a true value it causes read-protected pages to not appear in page listings and search results unless the browser has already been authorized to read them (based on suggestions from Nils Knappmeier, Neil Herber, and PITS:00344).
[[page:]] and [[linebreaks]] v1 markups from cookbook recipes (suggested by C. Ridderström and P. Ogay).
$UrlLinkFmt to have rel='nofollow' attribute in external links.
...
tags (PITS:00074, reported by John Rankin).$HTMLHeaderFmt, to allow disabling of inlined styles.
{$Title} markup (PITS:00177, thanks to Neil Herber).
{$Titlespaced} (requested by H. Fox).
$PageEditFmt.
(:description:) markup for setting <meta name='description' ...> (PITS:00016).
[[target |#]] markup.
[[target|#]] (PITS:00049).
(:keywords:) markup (PITS:00089).
$DefaultPageTextFmt.
$MaxIncludes default value to 50.
$WikiWordCountMax and $WikiWordCount functionality (PITS:00007).
$EnablePostAuthorRequired (variable was misnamed -- thanks to John Feezell for reporting the bug).
[[Drawing:SomePage]] is converted to (:drawing SomePage:).
(:attachlist:) links (PITS:00192, thanks to Brent Zupp for reporting this).
(:attachlist:) markup (PITS:00001).
[[ target | text ]] links (PITS:00149, thanks to Klonk).
[[{{free link}}#anchor text]] correctly (PITS:00148, thanks to Klonk and kt007).
{$fmt} and {$var} markup rules.
[[text -> target]] when target is empty (thanks to S. Leite).
(:nl:) handling (thanks to Balu).
$LinkWikiWords set off (thanks to Steven Leite).
%align=left% and %align=right% Wiki Styles for images (PITS:00009).
[[!Category]] markup (proposed by jr). This is still experimental, and may be changed/removed for 2.0.
(:searchresults:) directive with parameters (thanks to Knut Alboldt for finding this).
$EnablePGCust.
`WikiWord markup to protect `Group.WikiWord.
(:if:) markup.
$SearchPatterns (PITS:00066, thanks to PRZ).
$AsSpacedFunction and AsSpaced.
$LinkWikiWords to control Wiki Word linking.
[:nofooter:] (PITS:00080, thanks to PRZ).
'+big+', '-small-', '^super^', '_sub_', {+ins+}, {-del-} and `WikiWord (with credit to John Rankin).
--<hanging indent text (suggested by John Rankin).
$GroupPattern bug in trails.php (PITS:00057, thanks to John Rankin).
$LinkPageSelfFmt to specify how self-referencing page links should be formatted (kudos to John Rankin).
[:table:]). May still need some testing.
$EnableIMSCaching=1; in config.php.
$UrlLinkFmt, $IMapLinkFmt (PITS:00050, thanks to John Rankin)
[[<<]] markup (thanks to JF)
$EnablePathInfo support.