Originally Posted by DavidZ
I've since found this post
that says this feature was dropped around 2011 for cars without the Premium Package (where manual seats also be came standard) and cannot be coded as it is hardware dependent.
If the mirrors can still tilt, that seems like an artificial limitation to force people to get extra options.
EDIT: Seems this function is tied to the module that controls power seats, so if your 2011.5 M3 has manual seats that module is missing. Lame.