About the shutting down a stolen car remotely ... It could be a gradual speed reduction limit, combined with an acceleration inhibitor, i.e. 60 ... 59 ... 58 ... 57 mph and so on at a rate of a few mph pr second. And if it slows faster than that, then that would be the new limit speed. Shut down to 0 mph or leave it at - say - 10 mph, to allow the car to be driven to the curb or otherwise into safety.
That, and a lockdown timeframe as suggested previously, i.e. "don't start until 7am or later (unless pin code is entered)"
Next thing up, put a fingerprint reader in like the one on iPhone 5S, also optional. In that case, require
1) FOB in car 2) fingerprint read correctly 3) weight in seat
before the car will go.
If I was living in a really bad area, I might be happy to have an option as well to enter a pin-code every time. Combine that with TWO pin codes:
1) Normal pincode - normal operations
2) "hijack pincode" - seemingly normal operations until predefined timeframe / distance, then shutdown.
That way, even at gunpoint, FOP and the owner typing in pin code would let the car go - but only for so long, then a total lockdown and "Call momma Tesla for help!"