For me, the feature I would want most is a key fob that can find the car. There are already after maket devices for sale that "sort of" do the job, but I find them to be unreliable.

I would like to have a fob that when pressed points the direction, indicates the distance, and elevation of my car.

Any features you desire that do not exist?

__________________
2006 X5 Sport 4.4i