[korhojoa]

I don't see why a slider couldn't work with "Auto".

Setting the temperature where one end is minimum, the other is maximum, and between them you have a choice of degrees.

Activated vents would probably be better kept as buttons instead of being on a slider, I might want to use the floor vents at the same time as the defroster.

Fan speed (imo) should be on a knob, like a volume control. It would be fun to see it move, like a motorized pot on a receiver.