Thats like asking for b17's to have a mini screen where you control the rear guns while still flying.
Well kinda

(we sorta have that already don't we, minus the elevator controls)
On the other hand, a tank crew worked in unison.
The gunner didn't have to jump out of the sight to look at the gear shift. I read or heard about tank commanders giving commands to the driver by touching them on a shoulder or different part of their torso. In another thread there was a request for throttle control in tanks.
I notice there is such a control in PTs.
Something along the line of better tank control while in the turret is something
worthy of a wishlist thread. In terms of priorities for HTC, I don't know how high it would rate, but definitely would improve precision tanking.