I see no reason, though, for individuals to make the tweak to their own copies—of any shader whatsoever! So long as the amended versions aren’t handed around.
That’s fair enough, although they can only edit shaders that are made in Shader Mixer such as Visual Style. That, and I wouldn’t recommend attempting to make any changes unless you have basic knowledge on how to use Shader Mixer, which not a lot of people do as documentation for Shader Mixer is still a bit on the lax side. There is one very good tutorial on the store, but that’s where things get a bit awkward because most people expect the documentation to be in the Documentation Center, and not available for sale on the store (even if it’s free, as some of the official tutorials are), especially so if they’re migrating from Poser (which has free documentation built into the program).
Of course if anyone does decide to make their own personal changes to the shader (which they are free to do provided the don’t redistribute it, as you said), I did try my best to label and organise everything in a way that’s easy to understand. ^^” However, not many people like the thought of having to take on a DIY approach to things like this, which is why I try to incorporate more and more features into each product I do to make them easier to use. Case in point, my next shader (which’ll never see the light of day at this rate, seeing as Daz still haven’t fixed Anisotropic Specular in Shader Mixer) is going to have tiling textures built in, and i’m gonna try my best to make it support Fabricator textures/settings.