Instead of telling each wheel the turning angle an automated system should calculate the right turning angle based on wheel position and the center of turning circle. The center of steering circle could be align with the center of mass for the rover.
For setting the turning radius a new slider could be added. This will affect all the wheels on the rover.
Of course a button to switch from this system to the old system.
Wiki: https://en.wikipedia.org/wiki/Steering
Multi-wheel steering example: https://www.researchgate.net/publication/303796653/figure/fig6/AS:411836919894021@1475200981855/Ideal-relationship-of-the-wheels-steering-angle-between-both-sides-in-a-multi-axle.png
I think this will be a great addition to the game.