Could always remove the driver's airbag and install a quick disconnect steering wheel lol.
But if someone really REALLY wants the car they'll do whatever it takes. Only way to really stop that is to only drive back and forth to a secure location and garage it at night and own a few dogs and a gun.
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.