I'd like to see a more detailed and helpful user interface on the forums.
Instead of having to go through each thread I need to keep track of and having to subscribe to it and get email updates, why not make a little space on the top of the forums where, once a user is logged in, they get notifications that a thread they opened has been replied to, or a an AJAX popup slides in and alerts users to new thread/post activity? Much better than subscribing to threads I reckon. More convenient.
I'd also like to see an extra button on Support Threads created by users that lets them flag their issue as 'Resolved', or 'Still Needs Attention'.
I find that when I create a support thread and an x10 staff member replies once, then I ask another thing in the thread, it takes a while for a staff member to come back to that thread and reply again. Having a 'Still needs attention' flag or something like that would be extremely useful for support threads.