I understand the button logic, although I think the right solution would have been to resort the list on the screen. Zoom - counterintuitive!!! I always get it wrong. At list it is quick to fix as the hdd-based nav is very fast.
I don;t have a benefit of the old i-Drive bootcamp, but the new one is still too complicated and requires too much attention from the driver. My old acura had the same type of a selector and it was much more intuitive. Kudos for the graphics quality and speed! Much better than what I expected.