Any abusefilter pulling from a central wiki has two databases it uses, but there's no way to edit the global ones from secondary ones (or even view them, from what I can tell).

There should be support for that for secondary wikis, such that anyone can see the full list of what affects their wiki, and any users with the correct rights can also add/remove from either the local or the global abusefilter as needed.

This way hassle would be removed for local admins who find something that works and want to share it, or stewards who happen to be testing on an affected wiki (especially when the central wiki isn't affected, but several others are) - one box check there and the extension moves it to the appropriate database (although it might need an extra confirmation to make sure folks don't accidentally remove global ones from everyone else unless they really mean to, and such).