Mysterious Bob: The request board needs to be moderated.Been there, done that, it's too much of a headache for the poor soul assigned to moderate it, unless he/she volunteers . GMods can do their best to get rid of whatever's reported, but anything beyond that is as I said IMO.
L.o.t.F.: Each member can only have one thread at the requests. And in that thread, he'd make all his requests.+1, but with no moderating powers or else they'd be able to delete the old thread whenever they wanted a new one. That means no locking option either, I rather have someone posting a common request in an old thread than starting a new one for that matter.
Random suggestion, make the whole request board into a single topic, it'd be such a mess people'd be discouraged from using it.
Btw, is getting rid of that section an option for the future if it becomes too much of a hassle? Just asking because you don't mention it, and requests are of no importance to the forum.
Use anything you want from my works. If you need to contact me use email, not private messages.