Offer a more pronounced warning when the charge port door is open, perhaps with a one-time audible beep. Currently there is only a visible warning on the display that is easy to miss when first starting out.
All new cars include auto-closing feature, so we’ll consider this implemented.
Apparently, Tesla has implemented an even better solution in the latest generation cars: A powered charge port door that opens and closes on itself. For cars equipped with this kind of charge port door, this issue is pointless. It may be a nice update for older cars (like mine), though.