Not sure where it is on an E4OD but just an idea, use it to make a dead man switch with it.
On mine, I used the clutch pedal safety switch. At least I don't need to step on the clutch to start it anymore either.
I've hidden a small toggle switch, when on, the truck will start, when off, it cuts power to the starter no matter what. I love it.
You should do the same with your NSS.