I just did a little search of my own, there is actually a mod for vBUlletin that allows auto-locking.
(I know how you guys don't do the "unofficial" mods, but it is out there.)
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.