Well, think of it this way too: If you are at all unsure where your throttle is set, just press the corresponding key to set it where you want it? "Sht, is my throttle at zero or foreward/reverse one?" <press idle key> Solved. It takes the guesswork and continual visual referencing out of the equation, which is realistic as to how pilots in the real world operate their throttles, and to how the mechanism is represented in game. We don't look at the things, and the GoI throttle quadrant is pretty conducive to muscle memory operation.