I thought that the car (i3) was auto-locking when you went far away for a couple of secondes. Isn't the case ?
Mine doesn't, but I have the base-est model out there.
I have Comfort Access with Giga trim and my car doesn't automatically lock like this.
I believe another feature with Comfort Access (if someone can verify) is the illuminated outside door handles. The illuminated handles also light the ground (somewhat) near the door. Another few things to consider.
I thought someone mentioned in an earlier forum that the cool blue interior lighting, when unlocking the door, was part of the Comfort Access package. Not sure if that is true or was confirmed.