You could put a $2 switch in the plastic housing behind the mirror so you could flip the switch and disable the power to the RC-DLR. Then get out within your auto lock time, because for all it knows the fob HAS left the vehicle.. Later use the small/flat, non-electronic, key that fits in your watertight bag to open the door.. flip the switch and voilà! You can start the car.Disconnecting the Remote Control Door Lock Receiver mounted to the windshield directly behind the rearviewmirror will disable the keyless entry...
Make it a black switch and nobody will notice it. Lock your teens out from joy riding... lots of uses!