We don't roll for scores in my games. But do you mean point based chargen, or point based advancement? The former is in the DMG, and I've been using it mostly since 3e came out. I'd like to see good rules for adapting d20 to the latter, though. The options I'm aware of don't quite cut it for me, and I want to still be able to use all the stuff I have for d20, so I want it to be as compatible as possible.
That said, I think it may be more trouble than it's worth. Better to just pick the level you like, and stay in that range if that's your proclivity.