Can I also suggest that you add forward/backward navigation buttons (like a standard web browser) for use on the community tab? At the moment, if I'm using the community tab to browse this forum it's pretty hard to navigate - for example, you can't ever (afaik) go back to the previous page of a thread - you always have to go back out to the main forum page and then back into your thread.
I guess an alternative (although it would probably be better used in conjunciton with forward/backward buttons) would be to implement something like the Firefox addon "Auto Pager", which loads multiple page threads into a single page more details
here.
[EDIT] It would also be good if it could use my browser cookies from Firefox, so that if I've already logged into the forums from Firefox I'm logged in in the PT4 Community window.