Anyone wired a self latching or other type of anti-theft kill switch ?

That's why i think a self latching relay is the way to go, you'd turn the key to the ACC position then push the button one like hemi71x described would be kool which would arm/latch the relay then turn the key to start, but everytime you turn the car off it unarms/unlatches and needs to be armed everytime the key is turn to the off position. Stopping the need to turn off the kill switch everytime which I'd would usually forget to do.

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Pretty sure that's what the switch under the hood was for on the seat belt interlock. Turn the key on and then pop the hood and push the red button and the relay would latch and allow the start circuit to work without the seatbelts being latched. Turn the car off and the relay unlatched and required the button to be pushed again.