Using this method would fix the dilemma of which way should the tank turn in reverse, because it would be consistent. The method could also be applied to the keyboard, where the player could by default use Q&A for the left track, and E&D for the right one. Meanwhile, S could be used for a brake, and W is free for whatever. This is but a suggestion. If people need Q for driver turnout, then left track could possibly be W&S, and then use A for braking.