Why would this wish make you spend more money?
If you all ready have rudder pedals you could map the right and left breaks for GV's, just like you can currently with aircraft breaks. As for your other historical issue, my grandfathers best friend was a Canadian Sherman driver in WW2. And he said they did fire on the move (abet horribly inaccurately) so I don't see any reason to remove that from the game. getting kills as extreme range is another issue, but that's going to take much more detailed work to show an issue with the AH model.
I really don't care for getting shot down by a main gun either but, there needs to be much more proof to show why it shouldn't happen. I suspect it has to do with the damage model and how HTC models the HE fuse for a tank gun. My personal opinion is that I think that unless the round hits something substantial (i.e. armor plating, wing spar, big cast metal parts) it would probably be more likely to pass through without exploding. But this may be all ready modeled, and we just can't tell.
I just don't see anything in your position that would change anyone's mind about the validity of this wish.