Wasn't that easy Stephen.
First off I don't think any tank we have had the ability to put one track in forward, and the other in reverse.
If I'm wrong, please, show me the specifics and prove me wrong. But do the bloody footwork. Don't expect me to do it for you.
So then what your left with, is low gear, max brake on one track and full forward on the other.
Which if your on solid ground, slow, and careful happened. And it would get you a fairly tight turn. But if you were on softer ground you'd break a track. And then there you would sit till a repair crew got to you, or you got scared and boogey'd out on foot.
The side stresses on the track pins to do that kind of turn on other than paved or concrete is huge.
If you did it very often you'd start jumping tracks, etc.
Yes GV's could use some better control options for driving.
We should have the equivalent of a right and left brake lever, one in each hand.
A clutch for changing gear (left foot) throttle (right foot)