Personally I think some options on offer (Comfort access a case in point) are offered for 2 reasons:
1) Some MPV's and other vehicles have features like this as standard, BMW probably offers it as an option in case you have a bee in your bonnet about having "it" because it is on another car you might be considering.
2) Company car buyers have a certain budget to spend, most such people will probably add on more options until their budget runs out. You get remote control central locking as it is, with buttons of different shapes making it easy to unlock the car without even taking the keys out of your pocket. Occasionally I'm carrying a child and bags when I enter the car and still don't see the need for comfort access.
OK so you still don't have an answer from someone who has this option... could it be that no one bothers with it?