I have heard that you should not use the handy little button on your T/A shifter to actuate the trans brake. I have heard that when you launch you may squeeze your hand a little which will actuate said trans brake thus stopping you quickly. This sudden stopping action may also send you forward in the seat which can cause the shifter to move into the neutral position, which is not good because neutral with the trans brake actuated is now reverse. This causes the wheels to go in the wrong direction at the starting line while your opponent is heading towards the win light. (I heard this mission was accomplished several years ago, not recently when a transmission was exploded)