spaw, I would think that 2 forums for this place would be quite enough. Having said that, it is quite possible to introduce other forums whith a minimul impact. Have a look at my modification to the code for the Annexe for example, I offer 1 list like here but allow a user to choose whether they want to have certain areas included or not when they view it. Just one of several possible approaches.The only real handicap other than a user making a choice and setting it, is that a person has to choose on thread creation, which forum to post to - not much more complicated than deciding whether to call a thread BS, or musical, the rest looks after itself.
Thre real sufferers on that and other approaches would of course be those who feel a need to guaranteed being heard in the whole forum. If I was to say "Fuck Em" to anyone, those inconsiderate people would be precicesly my target.
Jon