There were 3 options: have LSC replace NPW when one was FS, have it add to NPW, or not use it at all.
Obviously option 3 was not acceptable, so we were left with having it add to NPW (potentially leaving some points in LSC useless, for example if you had a 3 in NPW there's no need for anything about a 2 in LSC) which was equally not acceptable, so we settled on the first option, having it replace the NPW skill, only for lightsabers, and only if the person was Force sensitive.
Seeing as how it's a completely different weapon from all others, and somewhat logical to assume that even a "NPW master" hasn't trained with a real one to the extent that even a force using apprentice has, I'm debating whether the NPW skill when using lightsabers for a non-FS should be capped at 1 or 2.
My point is that none of the given options was very acceptable, but the one we chose we saw as the best for now. If you have any reasoned arguments for another way, I'll gladly listen in the Force or suggestions forums.