If it only does it on inserting the key, I'm not sure it's all that helpful. A lot of households that share a car in this fashion have one driver significantly larger than the other (say a normal to tall sized husband a petite wife combination). It wouldn't be a big deal for the wife, but the husband would probably have trouble climbing into the car with the seat at his wife's position. Having a button on the door, where I assume the Sedan's button rests, removes this problem.
It it goes by the button press on the FOB, then that WOULD be ideal.