It won't turn off for a reason. Imagine the battery in the FOB dying on you while driving. You would probably prefer to drive somewhere to replace the battery than to be stranded.
And I do use it, for instance when cold out and the car is still cold. I may stop at a convienece store and will leave it running but you can lock it so it is safe. Just a little warning light on the i-Drive which goes away quickly.
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