There is nothing to work out IMHO. mjpg (posted above) has provided the ideal “Work Around” that I think is perfect. Use another plugin to augment this one and provide even MORE flexibility to your permissions.
Don’t ask the bbPress developers to take their time to reinvent the wheel when someone else has already done it. The Drupal community is excellent at referring to each others modules as “dependencies” for certain functionality.
WordPress has a ways to go in this respect, but I have to admit bbPress is better than any of the Drupal offerings when combined with a nice $40 theme purchased online. The phpBB –> bbPress transfer tools are also both quite useful. I just switched to bbPress and plan to be using it for a long time to come so keep it coming guys! Great work!