Leaving the driver’s door open, of course, gets that ding ding ding thing going... That triple honk when you shut the door is a safety feature to remind you you’ve removed the fob from the car and the car is still turned on and running. You could leave your fob in the cubby by the shift lever while you get out to drop off deliveries (if you are not concerned with getting your car hijacked), or I suppose if you still have two fobs, you could leave one in the car.