I mean the THRUST and REVERSE is done witht the joystick.
I thought there a talk about this before on how to make the joystick so when you facing right and push right, it will fly right, then if you push the joystick to go left, it will reverse and fly left. Its like you elimated 2 buttons, but the switching from left to right, it also reverses, so insead of pushing the reverse button, this is done for you when you change direction.