1/2 second is a lot of time to kill with shift points, weight,or timing. the only way that I know of to kill that much time is a throttle stop. The best way to go is a plate style like: Dedenbear or #1 stop. I use a #1 stop. If I am racing in a no electronic class I take the air cylinder off and replace it with a spring. All of the other good index racers that I know of, do it the same way. If you will only ever race non electronic, you can use an ET Genie or an Easy Plate.