Target said it.
The only place you will have precise throttle control is in the driver's seat. So that's where I'd add turret traverse control.
As it is, I always keep in mind where the turret is pointing. Usually it's at either forward 45deg angles, so that I can simply stop the tank with the least square angles presented towards the target, and if necessary, get a shot off within a second of stopping.
With that extra control, you could change tactics immediately, without the extra time spent changing positions to turn the turret, keep the speed where you want it, jump to the top position for a clear view, etc.
Ideally you'd have control of all the controls, in any position, but I'm too sleepy to think of what the best way to do that would be.
And of course, having control of individual tracks as well would be just as useful. No more 8 point turns.
