BuddyPress.org

Yes, it will still be possible to do this, but it will take a little smoke and mirrors until forums aren’t only for groups in BuddyPress. Forums don’t care who made them, but BuddyPress still needs a mechanism to gather and present the information outside of a group setting.

If it doesn’t make the 1.1 release I’m hoping to find the spare time to offer a “forum directory” plugin at the 1.1 launch, probably similar to the members and groups directories.