All of these anti-theft measures are good but not without limitations.
Forgetting about the inconvenience factor, especially during inclement weather, triggering any anti-theft measures that requires opening the hood may be an obvious tip off to anyone interested enough to observe. At that rate, one may as well, remove a rotor or disconnect a wire to the starter or coil. (Unfortunately, you inevitably have to remember what you did and where you may have put things. And the glove box is not always the safest place for a would-be thief with plenty of time.) I vaguely recall a story about a different model car with a fuel shut off that permitted the car to be driven on the fuel in the carb bowl. I was told the car stalled in the middle of a busy street where it was abandoned and towed to an uncovered impound lot - left with the windows down - in the rain. When any kind of mid/long term storage is involved I generally disconnect a battery terminal with a "quick" disconnect terminal (pictured).
Having an in-cabin switch has drawbacks too. You can be in a hurry and forget to turn the switch. Wiring to a fuse block or the ignition switch is also not that difficult to trace. And, if the switch is not part of a relayed design, it may be prone to corrosion or wear and result in use of impolite language at inopportune moments.
Wherever the switch is deployed. it may deter theft of the vehicle, but not a frustrated thief's vandalism. The super duper smart thief first attempts entry by prying the rear window trim, and after destroying that, bends and breaks the driver's wing window where he can access the interior door handle. He then forces the ignition switch to turn with what is probably a monster screwdriver/prybar. With limited success, he pulls at, cuts or breaks soldered wires behind the switch. (Starting the car is still virtually impossible with a severely discharged battery.) Ultimately, the thief throws in the towel, but not before prying the console apart, including the air conditioning vents and facia, where he evidently cuts himself, in an unsuccessful attempt to access the radio. Despite plenty of blood on the punctured seats, and bloody prints on the steering wheel and window glass, the thief, who is never apprehended, is also the lucky thief, unless he contracts tetanus.
