It shouldn't take that long.
You just need to add three buttons: brake left, brake right, and invert torque for those GVs that had such a function.
As it is, rotating tanks is a lot slower than they were in reality (those that had torque break and torque invert), and is definitely a big tactical impact in practice, e.g. when you need to rotate on a hill's incline.
It is at least as worthy of modeling as correct flap speed in the F4Us and F6F, etc.
I think it is more important than that, probably of the same importance as correct elevator authority modeling in planes.