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DP tuner has a "no start tune" put it in that tune, pull the tuner and forget about it. The engine will crank and crank and crank but will never start.
If you want completely dead just throw in a battery disconnect switch could even do it in the same fashion that SpringerPop did with and electronic disconnect that would require a wave over an area to reconnect the disconnect relay.
I pulled the IDM relay and took it with me a few times when I had to leave my truck in a bad spot. It won't keep the engine from cranking, but hopefully is challenging enough to beat the average thief. Too much of a pain in the a** if you need to use it frequently though.
If a thief wants your truck, and you put a kill switch in it that means the starter doesn't turn over, then that means he knows what to start looking for.
If you put a deactivation switch like Pop's little mod, then when he hotwires it, the starter will spin but the truck won't start.
A truck cranking over repeatedly will draw attention, and also help convince the thief that maybe it's just a POS and not worth the time and attention.