I know the roundcube team is working on a plugin repository (my company donated the hardware and hosting), so i dont want to go too far and end up with duplicate functionality. I have not seen it, so I dont know what it offers. Thats why im suggesting to only clean up some of the chaos right now.
One thing im not too happy about is that the plugins are currently spread all over the place. This means I will only use plugins from someone that I somewhat trust to do the right thing. It's so easy to introduce security risks, either knowingly or unknowingly. By having a more centralized repository, all our eyes can look at checkins and see whats going on. Maybe by starting to consolidate, we can create a more trusted set, and other plugins will join.
I also find the wiki page to become almost too unwieldly. I cant see anymore whats new, whats been updated recently, etc. I have to resort to viewing the wiki history. Maybe we can structure that page a bit more.