I think BMW tend to agree Dave; this is from their online blog:
"Before attempting to activate the Launch Control in an automatic BMW, it’s important to ensure that your BMW is at a complete stop. This means that the car is not moving forward or backward, and that it is safely and legally parked. Make sure that you have enough space around you to safely launch the vehicle without hitting any obstacles or other vehicles. It’s also important to note that launching a vehicle with maximum acceleration can be dangerous, so only attempt to use launch control in safe and appropriate conditions, such as on a closed course or during a drag race. Once you have ensured that you are in a safe location and have come to a complete stop, you can move on to the next steps to activate launch control."
Bottom line is, it's dangerous to have it on a vehicle intended for road use.
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