First off, I think we have too much of a zoom to begin with. I dont know what the magnification is while in a plane, it sure feels like it must be at least 5x. While in gv's, the zoom of the TC is 2.5x, that can be verified by being in the Panzer IV, just go from the TC position to the gunner view and you'll see nearly the same thing (Panzer IV gun sight is a 2.4X).
I'd like to have a few different "hot button" presets for zoom, as in a 1/3rd, 2/3rd, and full. I find my gunnery is actually better if I'm not using full zoom.