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Killing the injectors while stopped kills the motor period, then it has to be restarted. Your van has this feature and as pointed out is done with the key. A hybrid does what you want automatically using only the brake and accelerator pedals. The hybrid can do this because it has a big battery and an electric motor capable of moving the car. So when you stop it killed or already had killed the gas motor, when you push the accelerator to go it starts moving the car with the electric motor and then restarts the gas motor but you hardly notice.
If its a problem with the scanguage powering down, wire it to a power supply that works with the key in the accessory posisition not just the run posisition, and don't turn the van key all the way to off just to accessory. Maybe your van is also diverting all power to the starter when you turn the key then I don't know.
I would not reccomend doing engine off coasting in that van. The power brakes will work fine for a little bit but then you will lose power assist and it will take much, much more effort to stop as well as losing power steering. Also you cannot restart it unless you come to a complete stop and put it in park.
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