I think you need to let your DS know that you don't mind that he does it on the straight, or at very low speed cornering, but not all the time. Not until he's more experienced. Chances are when he's been driving a few years & had some different experiences of different situations, he won't be so relaxed & easy going all the time. He'll choose to be more in control at times. But you don't want to risk it just yet when he is still inexperienced & not really sure just how unpredictable a car can be at times.

Saying that... I drive like a bloke One hand on the wheel, arm resting at the window One hand reversing, low speed cornering & out of town, but 2 hands cornering in town & on the edge of my seat in the city I don't do city driving well!