Sometimes I like to sit on the tarmac without my engine starting and auto takeoff on, so that when I'm ready to start up the prop doesn't snap around to the starting position. This can be done by hitting E just before you spawn, or turning the engine off and then hitting E twice lightning fast. I have a button on my throttle for engine start/stop, so what I do is hit E and the button at the same time, works like a charm.