[King of Old School]

There is something of a nascent ads/disads system in the form of "Character Failings" under superpowers.

That said, I agree with those who say BRP doesn't need a comprehensive, GURPS-style ads/disads system. I really like BRP precisely because it's not just GURPS with percentile dice. It's simple, elegant, flexible and easily customizable. Like Sergio, I'd prefer any kind of ads/disads system to be supplement- and setting-specific.

KoOS