Get the package if only for the HUD... simply the best piece of interior technology in years.
As for the key thing... as I recall the F10s without comfort access have 1 sensor that receives the signals from button pushes on the key and perform the desired actions.
With comfort access, there are actually 5 different sensors that detect the key fob and allow the chosen actions to occur. For instance there is one in the trunk.. if you throw your key in the trunk, you cant lock the trunk. It also uses the sensors to know which door you are walking up to so it can be opened.
Finally as alluded to, CA cars have special door handles that have ridges on top. Simply press your finger on the them to lock the doors when you leave the car.... (to unlock you just pull the handle with the key in your pocket).
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