Wish List:
"Adjustable" levels of regen braking.
We have both a MS and a BEV i3 and I love the strong regen on the i3.
My daily commute is 20 miles one way and I can often get to work without ever touching the brake pedal in the i3. (Unless someone cuts me off in traffic haha).
The MS gives a choice between "none" and "standard" which is fine but I wish I could get a stronger level also. The MS regen will not bring you to a complete stop and neither will it significantly slow you at speed.
At first my wife was thrown off by the i3 but after a 1000 miles of driving, switching back and forth between cars, she's ready for the i3 level of regen in her Tesla.
It would be awesome if the M3 gave a third, higher setting.
As new EV drivers progress in their one-pedal driving skills having the ability to switch to "max" regen would be really cool.