I mean cars that are controlled by the computer. (Just like the other racers in the racing missions of the normal GTA game.)
And about my second request: I want (the ability) to make a second serie of checkpoints for the computer controlled cars.
And I think it would be cool that if you press the 'c' key, or whatever key the makers want to assign to this function, a checkpoint for computer controlled cars is created at the spot you are at that moment, so the computer controlled cars will follow you.
(Of course the computer controlled cars need to be not too smart, so you really have to guide them.)