Coming on really well I'm very impressed.
I think all you need to do with the controls is make the mouselook independant from the turret. So you can look about with 100% responsiveness like in an FPS but the turret will turn slower and line itself up. This would then free up the right mouse button which could be used instead to automatically line up the tanks movement direction with the way you're facing.
Driving the tanks in Call of Duty 2 was pretty intuitive, you might want to take a look at that.
I think all you need to do with the controls is make the mouselook independant from the turret. So you can look about with 100% responsiveness like in an FPS but the turret will turn slower and line itself up. This would then free up the right mouse button which could be used instead to automatically line up the tanks movement direction with the way you're facing.
Driving the tanks in Call of Duty 2 was pretty intuitive, you might want to take a look at that.