For most of my projects I let people use the Github issues for support and it works out fine. I can understand, though, if you want to contain that knowledge in bitcointalk. That said, it's difficult to find what the outstanding bugs/issues actually are, and so I imagine you have lots of repeat questions about things. It's also hard to find stuff when all knowledge about the project is lumped into a single, linear forum thread. I'm sure you have your share of opinions about bfgminer, but an open and thriving issue tracker is a definite advantage of that project: https://github.com/luke-jr/bfgminer/issues.