I suggest as a nice hack text < 8 words in the body should be refused to be posted, this will significantly reduce spam.
It's nothing personal, I just don't recall ever posting anything with less than 10 words in it my entire time here, each message ocupies space and one word posts seem to create a lot of spam.
This would also reduces the 'bump' syndrom too of trying to keep a message at the top of the forum.
On a thread I'm subscribed to I don't want to wade through ten posts of "that sucks" and "huh what's the deal?"
As for quick response.. I don't know if I've used that feature or NOT! (LOL!)
Perhaps as a suggestion to the author of Vbulletin you could ask him to allow "plugin" features so you don't have to reapply hacks all the time to add features.
cyb