I've no idea how hard this would be, but I wouldn't mind a slightly more intuitive URL button. I don't get around much, but most of the forums I frequent, do a better job.
I select the text I want to be web linked, then get a pop up for the http address. The the text is formatted as (URL=http:www.something.com)text I want linked(/URL).
Right now it just does (URL)(/URL) around anything I want to set up.