The PC games post on the appropriate game board when they need help. Some of them mingle in with the community.
As for the idea though, I would have to disagree. Having an off-topic board is enough IMO. Sure, there will be more places to post...but that's just more places you have to look at to keep up with everything. I mean, we don't want to start looking like Gamefaqs where there is a board for every game.