If you watch DeMuro's review, have a look at the two 3D-wheely-buttons on the steering wheel. I think those would work well as a tactile interface - the only pr

If you watch DeMuro's review, have a look at the two 3D-wheely-buttons on the steering wheel. I think those would work well as a tactile interface - the only problem now is the mode selection. Couldn't a software update give you the mode selection on the left-right click on one of those things, and then you have 3 degrees of freedom to adjust with the remaining knob functions? Not saying this would be a perfect solution, as you still (1) have no good indicator for the mode other than the center touchscreen and (2) need two actions instead of one to do anything. On the other hand it would now be a complete hands-on-steering wheel based approach, so the tradeoff could be worth it.