I think all of the sections are collapsible so that is similar to parent/child forums. I think child forums tend to get lost, so I'd like to try it the way it is, but if we really see the need, it can be changed.
I love suggestions for new boards! I think the gamer-finder may be a bit premature for us right now, but definitely something to keep in mind. Shameless plugs however is doable!
Keep 'em coming!