You know, Gunny and I have discussed this idea on several on several occasions. It was made clear to me that I would be responsible for the forum and I even so far as to draw up a set of rules. However, with our current population at USMB, I just don't think it would work. The only way to enforce such a forum would be to delete posts, issue in fractions and ban the hell out of users. I just don't want to create that kind of environment here, even if it limited to just one forum. That is why I haven't pressed the issue.
I can't speak for anyone else, but as one of the more vulgar and flame throwing trolls around, I know I'd have no problem respecting the stricter rules of such a sub-forum. But I see your point.
Another possibility, which may or may not be more work, is to have a moderator review and approve posts before they actually get posted. That would really cut down on the number of posts in violation, since people would know it's never going to see the light of day. Not to mention that it would discourage nonsense participation as nobody posting nonsense wants to have to wait to see it.