hmmm. might be possible...but ive never tried it, and if you want to try it, its up to you...attempt at your own risk.
but just make a map where in the 0 column of the fuel map, you have 0's up to 1000rpms and then make the rest of the map the biggest negative fuel value. might be enough to kill the car. beats me. but keep in mind when you first start the car, it will stay above 1000 for a while.