I've have the same problem.
I've had my own forum running before, but it was constantly hacked, regardless of how up to date I kept the installation. I did manage to prevent most spambots, but the hacking just got tiresome, so I stopped running the forum.
Are any of us here more familier with the mods on this site? Judging by our post counts none of us (at least on this page) are regulars, which might make things difficult (a bunch of non-regular members requesting a whole new forum are not likely to get it. If they did that for everyone it'd be chaos).
That said, I'd be happy to put forward case to one of the mods for a new section.