Ah. Well, in that case it's a good thing we have some parents-of-small-children on the FC.
I just chatted with Frolic on phone and he said an FC-only forum is totally fine. So I'm going to try to put Moo down for a nap and then I'll mess around with the admin settings, figure out how to put all the FC members into a special category and create a forum only accessible to those categorized people.