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Interesting question...is there a shader that comes with DS that I can check? Is it in the base ubershader? That sounds like something that is scripted. I did have a look under the math and state bricks under MDL/Default Modules. but I couldn't see anything that looks like a if...then do this type modifier.
Just had a quick look...I take it that your talking about in the surfaces tab how when you dial backscattering weight you get some additional options show up? It gives two additional options for Backscattering which haven't shown previously. Interesting thing is the network is the same in shader mixer. I imported it with it set at 0 and again at 1. I think that's more a surface tab coding thing than the actual shader. I would imagine the code is written to only show things when they get dialed so that the surface tab is easier to navigate.