Hrm, I think this is the wrong approach, though it's not a bad idea, necessarily. Really, what you're talking about almost sounds like implementing SpamAssassin for forums, which is rather complicated (those weights are incredibly sensitive, too--changing the values can throw all sorts of stuff out of whack).
I'd be more interested to look at the spam IPs, see how they're posting--are they open proxies? What? Open proxies or similar means should be trivial enough to ban... sure, you won't be able to get rid of everything, and it's still pretty complicated, but who knows.
I could be wrong, since I'm not terribly active on the forums, but the level of work it takes to eliminate said posts is rather small compared to the amount of work it takes to hack something up to "outsmart" the spammers -- and if you do, how long will it last?
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