1) The switch panel is a single unit, there is a different complete switch panel for each configuration, I.e. it's not modular. Not all buttons are meant to be populated. And some options are model specific. The things you might find there are heated front seats, parktronic on/off, ECO on/off...
We don't know the circumstances of her giving-up her share... what - if anything - has been agreed verbally (in front of witnesses)... or if it was done under duress. Was she of sound mind when she did that? Etc.
In essence someone who makes payments towards a house may have a claim for part-ownership, but the circumstances under which she gave-up her share will be questioned. This does seem like a complex case that will require expert legal advice.
BlueTEC Diesel engines can be expensive to repair if/when things go wrong... if buying one of those, I would get a mechanical warranty (if buying privately), or I'd buy only from a trader whose warranty I can trust.
38 all around is what I would do as well.
2-3 PSI above the high figure is fine, and if the car isn't loaded I would keep the same pressure all around.
Inflation pressure on the high side will make for sportier ride, lower fuel consumption, and lower tyre wear. The only downside is...
The Samsung phone will first need to be connected to COMAND via Bluetooth as a normal phone i.e. for voice calls.
Then, on the Samsung, go to settings, 'Connections', 'Mobile Hotspot and Tethering', and enable the option 'Bluetooth tethering'.
(The actual location of the option 'Bluetooth...