It would be nice to have a button to force a full lock. Done properly it should disengage when speed exceeds certain limit. That would be very useful when trying get moving from stand still on slippery surface.

This is one of the items I'd like to see there already from the factory and I wonder why BMW hasn't put any these kind of features there already. It's just a button and few extra lines in the software.

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BMW X5 3.0d 2004