This weapon system doesn't have a 3rd person aim sight, you have to use it with a 1st person view and the most important part is you are doing this when you are flying a plane. If it really be designed like this, please remove the 3rd person aim sight for bomb dropping as well to balance the system. Otherwise, DICE should redesign waffenbehalter. My opinion listed below:
1. Add 3rd person aim sight for waffenbehalter. OR
2. To remove the front seat once player upgraded to waffenbehalter. And allow the waffenbehalter gunner have guns a little angle adjustment. OR
3. Add a very good spot ability (extremely long range) with the 1st person aim sight so that the pilot can more easily in finding targets and doing the spot works as well.
Level 4 skill should be found balanced in the same plane, to every vehicle as well.