i started looking more closly at the webgui and found some things which could/schould? be on the roadmap.
1. Embeed pictures in HTML email and signature and of cource a better signature editor like the email edtor maybe? Also the email editor is very limited what about using http://www.fckeditor.net/ which is also GPL;ed? Would be a nice addition.
2. Dictonary support in email editing is a very nice feature :-)
3. The sorting i mentioned earlier.
I think it is time to make some kind of issuetracker or wishlist because with a growing community and "just" a forum the whises will repeat...
so long and keep up your great work.