Not bothered about the temperatures - if it isn't warm enough I'll turn it up as high as it needs to be to get me warm! Temperatures need to be the same if I'm alone in the car, not necessarily so if I have a passenger (that its the point of dual climate, afterall).
I did have the 'even' thing about volume but the Merc doesn't put a number to the volume.
My biggest OCD is about the position and level the vents point at. They all have a specific direction and level to point at and it annoys me if someone gets in my car and starts fucking with the vents on 'their' side.
Gone but not forgotten:
325i M Sport (E92), Black Sapphire, Coral Red Dakota, 19" 225's, Seat Heating, 6FL and de-badge
Replaced by 6.2 litres of AMG powered C class.