I noticed this myself...quite by accident as well. I did about the same thing you did, I was coming to a light and just killed the engine without thinking about the shifting and I then clicked the ignition back and it fired again...I was pretty excited as well but I decided since people say that turning the engine off while in D regardless of whether you're moving or not, is a bad idea that I would not do it intentionally. It's definitely worth more looking into though because if it doesn't harm anything it would be useful for sure.
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