And now for my second idea.
I have always found it annoying how that you are taken back to the thread after posting a reply.
It seems much more logical to wish to return to the Forum itself.
By glancing at the source, it appears that the link you are "taken back to" is generated from a "$_" style variable. I have a feeling simply changing that "$_" to the link of the current forum is easy, but I don't know UBB well enough. Knowing these types of changes, it's probably pretty deep and might not play nicely with the caching. Or just clone whatever happens when you post a new thread (instead of a reply to one). That takes you back to the forum.
Anyway, tell me whatcha think.