Good that you asked, as this forum members are quite helpful, especially to novice. I gathered lot of info from here, before I ordered my M3 LR
1. You get only 4 external colours and 2 seat colours to choose from. There are no other options available to change trims. SR and LR comes only with 18" Aero wheels (the ones with dark grey wheel covers). There is no option to get any other size or look for the wheel. Performance version comes with 19" silver alloys
2. I've owned the car only for a month and did my long drive last weekend. My calculation is that,the car loses 1.25 to 1.45 miles of battery range for every 1 mile of actual distance driven. Approximately 135 miles worth of battery to cover 100 miles of run.Of course, it varies if you ramp up heating/cooling, if you use fog lamps, how many people are riding the car and how hard you hit the pedal.
3. I've installed tethered(prevents cable theft) Rolec smartcharger, which apparently can be locked thru the phone app so that no one steals your electricity. I'm not sure about this, and have heard lock keys available as well. They have installed something called "Matte Unit" instead of earth rod. All looks neat and tidy.
4. Windscreen wipers are auto activated, though not as sensitive as my previous cars. However, slight press on the left stick gives a wipe, and long press gives wash and wipe. I haven't operated the wiper thru main console yet
Hope this helps