Doesn't work... we can pitch down at the same rate as pitching up. That's called a "red out" in fighter pilot speak, when you pull negative G's (compared to normal Earth gravity). The human body can't handle that as well as pulling positive G's when pitching up, although too many G's will cause "black out." If you were able to pull the same G's laterally with yaw, it might be somewhere in between, but you'd be falling sideways out of your pilot seat.
My handwavium explanation is the same as it is for the overall flight model. It works almost exactly like a jet fighter in atmosphere, right down to the max turn rate with medium throttle, and the speed caps. You have limited rudder authority in a jet fighter, because you're supposed to roll and pull vertical G's to turn (a more efficient use of the main wings).
So... we're on a fly-by-wire system that mimics aerodynamic combat. The reason is that the same ingrained skills will translate to the expansion when we can land on planets, and fight other ships in their atmosphere. No need for a transition between spaceflight and atmospheric flight regimes.
That's my theory and I'm sticking to it, because nothing else makes sense.