First, it wouldn't really work on any type of circuit, even São Paulo, so then a new area would have to be modeled. Second, it doesn't fit a racing game, it's basically just a point A to point B scramble, stopping to shoot in the process. Keep in mind what has been stressed in this game: flowing game modes with constant forward motion, not vehicular arena death matches. Try to work on modes more like race/eliminator hybrid modes with tactical twists, and not too many extra features (like new models) to have to include.