I would like to see a small change to the message display in Side View & Threaded.
Currently, the message display has userinfo on the left side, and then a "header bar" with the subject and "edit" and "reply" buttons. I would like to see that "header bar" at the bottom of the message body (a "footer bar" of sorts).
The reason for this is that when in threaded mode (where you see only one message at a time) and you read a long message, you have to scroll all the way up the page to press the "reply" button. You would think if you wanted to reply to a long message, you would want to reply after you finished reading it (you know, at the bottom!) =)
I'm gonna try to hack something like that in myself, if I'm successful, I'll post the code changes.