Been a while since there was anything new happening in here, so I figured I'd bump this up now that I've found a little time to tweak things again. I updated ads245's spreadsheet with a couple of things I can't quite recall seeing confirmed previously. I added turning off the seatbelt minder chimes as well as 'Dark Car Mode' which I recall a few inquiries about, but never any confirmation it works on the 15+ model. I can confirm it worked for me.
What are the challenges that need investigating further? Other than the auto-folding mirrors, my tow mirrors don't exactly have power-fold unfortunately.