OpenID feature on translatewiki UI
Fragment of a discussion from Support/LiquidThreads
+1 (I fully support your wish to add OpenID here. It is stable and works with trunk - the OpenID extension "trunk" version from SVN with MediaWiki core from git - see extension page. I use it on all of my private wikis since years without any problem.
I maintain OpenID since a while and have applied a lot of patches, and documentation, and suggest to always run the latest version. Extension:OpenID is currently only fully tested to work with MySQL database, PostgreSQL needs a onetime manual upgrade as some users reported to me.