I thought if you have a JB or an Evolve switch etc, you could just delete the map from the car. No map, not start.
That'd certainly slow thieves down wouldn't it. Yes they might have tools to remap the car on the spot but I wonder how many would think to carry the kit with them? Would they have enough maps for all the cars?
To be fair, a determined and skilled thief ain't going to be stopped.
MY14 Space Grey F11 530d M-Sport