AH-64_d

You can do all of those maneuvers without aileron input. Aileron input is only required if you are trying to "bank" left or right. For instance, in an airplane, you would enter a turn by toggling the rudder and maintain the turn with ailerons. Your MCX2 has 2 servos (elevator and aileron) and controls yaw by controlling upper and lower rotor speeds. If your MCX2 does not slide left or right in response to aileron input, something is wrong with that control. You already know that you can fly fairly well without it, so you will have to decide if you want to fix the problem or ignore it.