I'm moving from a Ford Explorer to an '05 Prius and am looking forward to the new experience. One feature of the Explorer I'm going to miss is the little keypad on the driver's door. If, for any reason I can't get into the car (threw keys into car while on a jog, locked myself out , etc., etc.), all I have to do is punch in my numeric code and I'm in. Does anyone know if this is an after-market accessory that we could get installed in/on the Prius?