[Michael Cule]

Some kinds of cons (those depicted in THE STING for instance) require somebody to act as a director and/or designer of the temporarary reality you are setting up.

I think that for something like LEVERAGE you could use GURPS Bang Skills (Hitter! Thief! Hacker! Face! Honest Man!) to keep things simple but this has the disadvantage of making GURPS too much like FATE for some people.