I played this a long time ago on consoles and just now bought it again for PC because I really love this series. I think the reason why you can't rotate the tank turret with keys is because they included turret elevation and the graphics to go with it at a much deeper level in the code than could be easily pulled out. With keys you'd either have to ignore elevation completely or add even more keys to control turret elevation and then it is much less intuitive than just doing it with the mouse. It is a hassle for me as I am unlearning decades of controlling vehicles with my right hand using arrow keys but using WASD for tank movement and mapping machine gun and cannon to mouse buttons works pretty well.
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