Suggestions for extensions to be integrated

Should be merged

 * CategoryTree — may be included as optional configuration variable [disablable]
 * CharInsert — thought he was admin it was in core :)
 * How practical is this extension for core?
 * Very, especially for all languages the use special characters, but also take a look at the average Wikimedia wiki's MediaWiki:Edittools.
 * I'm pretty sure the implementation of this could be improved dramatically. —Simetrical (talk • contribs) 12:42, 26 January 2009 (UTC)
 * Perfect is the ememy of good? Even though it has been adopted widely, it not being perfect would prevent it from being added to core, even though no one touched it since June 2006? (14584)? siebrand 15:16, 26 January 2009 (UTC)
 * Configure [disablable] ― every other web software system has had this since the beginning of time
 * DismissableSiteNotice [disablable]
 * Was implemented, then reverted. Needs a rewrite to make it less hacky-ish before being merged back in.
 * Inputbox [disablable]
 * Inputbox needs a rewrite, it's a little scary. :)
 * Got a pretty decent rewrite recently ^demon 08:23, 27 December 2008 (UTC)
 * Interwiki (at least the option to view available interwikis, see also InterwikiList) - merged in r45062, reverted in r45238 - "please continue working on it, it'd be a nice thing to have for third-party installations if the UI is cleaned up." (ref)
 * Nuke — isn't installed on all Wikimedia wikis, but is handy for non-Wikimedia users [disablable]
 * Was implemented in r41630 but reverted in r42117.
 * Poem — no disadvantages
 * Merged in r41710, then reverted in r43520
 * Should probably be &lt;nobreak> instead of &lt;poem> (&lt;nobr> is not an option because it is part of HTML)

Fully merged
These extensions have been fully merged into core and disabled on WMF wikis (Special:Version):
 * DeletedContributions — r41178
 * LinkSearch — very useful – r40830
 * Newuserlog — but there should be ability to disable it for wikis like Wikia [disablable] – r40769
 * UniversalEditButton [disablable] - r41916

Maybe

 * AntiSpoof
 * Assert Edit — Belongs in the API somewhere? Or does it?  Maybe the API obsoletes this, in which case we should leave it out (and force people to move to the API to get the benefits).
 * BackAndForth [disabled by default]
 * CheckUser — should not. There are laws in some countries forbidding logging of IPs, etc.
 * So it should be disabled by default. Soxred93 00:35, 26 January 2009 (UTC)
 * COPPA forbids collecting e-mail addresses in some circumstances that we don't accommodate (sites targeted at minors must ask for age and get parental approval if age < 13). And we don't provide any way at all for admins to comply with that.  Since when does the law of one country force us to not add a feature for everyone else?
 * What country actually forbids collecting IP addresses from being logged period? Some may require them to be discarded after a period, but CheckUser does that.
 * We already log IPs in rc anyway.
 * So this is an entirely unreasonable reason. All bulletin boards I know of, for instance, have similar functionality enabled by default, and they don't even typically allow you to purge old IPs. —Simetrical (talk • contribs) 12:41, 26 January 2009 (UTC)
 * Cite — still have some breakages and not properly handled by clauses
 * Well, neither is or  or any other XML-like tag, right? —Simetrical (talk • contribs) 12:36, 26 January 2009 (UTC)
 * ConfirmEdit
 * Duplicator — "copy" function available on most systems since the beginning of time
 * Gadgets
 * ImageMap — useful [disablable]
 * With the ability to use |link= now, probably not needed in core (see also: r41727, r41789)
 * Intersection [disablable] — a.k.a. DynamicPageList
 * Renameuser
 * Yeah, that'd be good.
 * Maybe not necessarily the current version, though; see also: 15212
 * SpamBlacklist
 * Tab0 (very simple usability helper)
 * Title Blacklist
 * TitleKey
 * Might want to merge this straight into the page table (as long as we get that easy schema upgrade ability on Wikimedia first...)

Should not be merged

 * Extension:AntiBot — zomg secret
 * BoardVote — Wikimedia-specific
 * CentralAuth — not includable
 * CrossNamespaceLinks — even now it is useless
 * EasyTimeline — while it is in Perl
 * ExpandTemplates — doubtable usefulness for usual user
 * It can make finding bits of code that are buried within templates much easier. If improved, it could even create a tree of sorts. Perhaps this should be in the maybe category?
 * FixedImage — Wikimedia-specific
 * OggHandler — external dependency
 * Oversight — to be deprecated by rev_deleted
 * ParserFunctions — ( diff )
 * SiteMatrix — Wikimedia-specific
 * SyntaxHighlight GeSHi — external dependency
 * TorBlock — needs cron
 * User Merge and Delete — causes irreversible changes (deletes users)
 * Username Blacklist — redundant to features in Title Blacklist
 * WikiHiero — too heavy
 * Maintenance - complete and utter hack, plus a security risk since a rouge admin could screw up the site via it.

Things to split out from core into extensions

 * Math rendering/texvc
 * It's a bit silly to have in core distribution, most people don't need it and it has lots of external dependencies.