Earlier today, I added [1] the long-awaited action=edit module to the API.
Currently, all WMF wikis have $wgEnableWriteAPI = false; , so action=edit won't be available on them (along with delete, move, etc.), which is probably a good thing as long as these modules haven't been tested extensively. However, I suggest this setting be enabled on Testwiki [2] so it can be, well, tested. Maintainers of JS scripts that use the API (like Twinkle, maintained by Carl Fürstenberg AKA AzaTht whose repetitive bugging sped up the development of this module) could probably help here: they'll need to modify their code to use the API edit features at some point and will be able to use TestWiki for testing, and in turn their requests will help testing at TestWiki.
If anyone runs into any issues with the API edit modules, feel free to bug me at #mediawiki (where I'm known as RoanKattouw), file a bug report at BugZilla (be sure to set component=API and assign it to roan.kattouw@home.nl ) or send an e-mail to the mediawiki-api list [3].
Roan Kattouw (Catrope)
[1] http://svn.wikimedia.org/viewvc/mediawiki?view=rev&revision=31514 [2] http://test.wikipedia.org/ [3] mediawiki-api@lists.wikimedia.org