if you look at the lever that the cable actuates on the trans its slotted on a shaft that goes into the trans and the NSS is built inside the digital range sensor which slides over the top of said lever. It is possible that it may cause it to bind but its very basic its nothing more than contractors to tell the PCM when its in reverse to activate the reverse lights and neutral or park for starting. I can't see how it would make it hard to shift. You could try backing the retaining nut off a bit to see if someone has replaced it at some point and overtorqued it causing it to bind.
New DD-2009 Ford Mustang GT/CS candy apple red.
(sold)2003 XLT Tan 3.0L V6 5-speed, Lots of mods.