Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
I'm still unclear how you can have private forum areas in addition to public forum areas. For instance, perhaps you want to set up a specific Q&A area for moderators. How do you "carve out" that space? More specifically, I want Drupal as my proxy source, so that we can pass a users role as well as authentication. Those user roles would determine what forums are accessible.
Is that possible? When I search for private discussions, I see a lot of comments about the whispering system, but that seems oblique to private discussions areas where multiple people participate.