I am looking for the micro switch on the handle that I have seen guys holding in their cars and dropping on the launch?
Using a button like that and holding it like a grenade will provide some slow and inconsistent reaction times. Get a good Biondo/Dedenbear button that you can adjust so the button has almost no movement until it releases, and mount it somewhere when you can comfortably use your index finger fully extended, or even your thumb will work fine. Personally, I'd mount it on the side of the shifter, but if you like the steering wheel that's fine too. A quick button with a quick release method (using no finger muscles) is going to give you the quickest possible reaction time. It's not easy to hit a .400 pro tree with a small tire stock suspension car, but I'll put it this way. If you do this and STILL can't hit the tree, one of two things are wrong.
1) You need to quicken your rollout, and you can do so by pumping up your front tires, utilizing shorter front tires, tightening up front end limiters for less travel, pumping up your rear tires, raising leave RPM, staging a little deeper by giving the brake pedal 1 or 2 more CONSISTENT bumps after turning on the stage bulb, etc.
2) You suck.
Take it from a bracket racer...