I hadn't realised that the interior lights etc don't come on as you walk up to the car at night. That's a PITA, as for the past ten years or so every car I've owned has turned the interior lights on automatically as you approach (or, in the case of the i3, when you use the remote to unlock it).
I believe you can open the charge port by just pressing the lower corner. Not tried it, just remembering the demo when I picked the car up on Friday.
I'm going to see how easy it is to make a small light to fit under the flap. Doesn't need much, just a single white LED, a coin cell, plus a tilt sensor and timer to turn the light on and off. Hopefully there's enough space available to fit it.