I don't use an NSS on my C4 auto. I can start my EB with the tranny in Drive. Just have to make sure there's nothing in front of me. When the engine fires, it takes off if I don't have my foot on the brake.
Well Gil, just make sure that nobody else ever drives your truck!
And the next time you have it at the muffler shop, or tire shop, or any other shop where they're likely to have someone in the driver's seat for even just a moment, make sure to tell them about it.
Saw a nice custom truck get driven off the back of the ramps at Quik-Way muffler once, because when they reached in the window to turn the engine on to check for leaks in the new exhaust, it was in reverse.
Didn't help matters that the custom shifter was hard to get a feel for, but that's how it goes when someone who doesn't know all the ins-and-outs of the vehicle get in it for the first time. And I think it was the truck owner that drove it up the ramps!
I'm just sayin'...
Yeah, I know you're more sensible than most, when it comes to these types of things, but wanted to mention all this anyway, in my safety-first kind of mindset.
Me, I'd have the NSS installed and working, but have an override switch installed for those times when you need the starter to work.
Paul