Cool to know that. Thanks!
I also don't like auto-dimming mirrors at all - particularly ones that revert to the auto mode without staying selected to the off position.
In my 1991 Q45, it was a manual rocker switch, so
stayed set in the mode I wanted!
Much better than my 1995 Q45! Which used an electronic switch and would revert to auto mode when the ignition was turned off ... Annoying even though I got into the habit of reaching up,
each and every time I powered my car, to disable the auto-dim mode!
On my 2003 M45, it is the old style flip toggle below the mirror! I love it.
Z