I'm not sure if this is possible, but I was thinking... What if for forum subdivisions we just divided it up like your game tabs are divided up?
To explain: when you click the Games link, and you see at the top "Your games," "Joinable," "Active," and "Finished." In my proposal, when you clicked the Forum link you'd see "General," "Draw Requests," "Meta/Multi Suspicions," "Rule Clarifications."
I'm not too familiar with PHP programming, but it seems like we already have the outline in place (the Games link) and the primary Games pages could just be replaced with a blank Forum page. Sure, you have to post in the one you want to use, but that's no different from a typical sub-divided forum.
I'll take a look at the code and see if I can't figure this one out myself. But if there's anyone out there that can see where I'm going with this, and already knows PHP, maybe they could contribute... :-)