Not true, mechanical stops are legal. I've run one since 1990. Plenty of ways to do it. Weight, throttle, restricted air filters, mufflers, timing, shift RPM, lift at a given point on the track. With my last car the mechanical stop was deadly, could move the car .01 at will. It doesn't work near as well with the new car. Most people use weight, I don't like it. It's a learning curve either way. Qualifying is down closest to index and is laddered on a sportsman ladder (1-8, 2-9, 3-10 etc). Under index puts you at the bottom of the ladder, the further under the lower you go. All classes run each other handicapped by index during eliminations. Most good cars can run within .02 of the index. No trans-brakes. You need the ability to change the car during the day or days to stay on the same number. The finish line can be fun with 8.75 cars running 13.0 cars.Slow cars have the advantage of no tire spin. fast cars have the advantage to leave last and chase. pick your poison. It's a lot of fun. Good luck.
Doug