I can't really imaging a huge difference. I've bought & fabbed brass nuts for accuracy, but I have a roller nut in my parts that I intend to try. There seems to be many indications that Jerry's primary concern was playing in tune. There is a thread here somewhere about Wolf II, and how it was supposed to have this fancy trem system that would stay in tune.
My guess is that tonally it's splitting hairs, and that any artifice that reduces drag across them nut/nut slots is a good idea. There are as many subtle ways to file/dress nut slots as there are luthiers. It's a work of judgement, and judgement is subject to inaccuracy. I personally like machined pieces provided all the ideal geometry is known from the outset. For example...are there ideal string gauges that the LSR works with? I bet it's a narrow selection...0.10's & 0.11's or something like that.
Just my opinion. I bet it's just fine.
"Hi Ho...the Carrion Crow...FoldeRoldeRiddle"