Can anyone please tell me how I can limit a forum's access according to post number ?

[peterska2]

I'm 99.9% sure that no-one is going to make a modification in place of a default feature. The task runs in the background and apart from the very first time, when you run it manually to bump all applicable users into the new group, the resources it will use are less than a modification which will double up on a function which occurs naturally in vB anyway.