Amazing piece of software there, compiles X-box, PS3 and PC code simultaneously, you can edit on the fly and see the results on all three at once apparently, which should hopefully stop the problem of dodgy ports.
But amazing stuff indeed, although I imagine if the player gets a bit overzealous and tries to knock down a city block it might give it pause to think, but hell, for standard playing environments I don't think it can be beaten.
Oh, and the 'en passant' rule is win, I've caught some people out with that before