I've asked this question before, but I couldn't retrieve the answer I received back then. Besides, both this plugin and bbPress 2 has improved significantly since then, so I figured I'd revive the discussion.
My dream use case for this plugin goes something like this:
Say I have 1 main website and 2 sub-domains, running together on a multisite:
Including its own discussion boards, the forum would be used for comments on blog posts from example.com, as well as wiki posts from wiki.example.com, both in their respective forum categories on forum.example.com. How feasible does this sound?