I can confirm otherwise, but only when using a mouse. There seems to be finite positions in which you can aim from the Commander's position while using a mouse. It didn't matter at which polling rate (resolution) the mouse was set for the aiming point was not smooth. The same position with a joystick is smoother, but still not as smooth as when in the gunner position. The difference is slight, but you can clearly see it when using a mouse in the Commander's position.