When you fly chopper forward with mouse and try to maintain same pitch with some horizontal speed, your chopper will automatically rise it's nose back to horizontal plane, slowing your speed and forcing you to adjust the pitch all the time, by lifting your mouse back to original starting position infinite times.
Mouse/keyboard users should have optional choice for cyclic control being more manual, and being able to maintain the different states of joystick, as if it were actually controlling a virtual joystick in any direction and keep it there, until moved back to it's original position. {F18668} {F18669}