Some of you are not answering the question exactly, some of you are. Lenora2 is not asking how to mix a new feature or behavior into a shader, but rather how to save the INCREMENTAL shader feature as a preset which can be applied to a figure (and all her mat zones) with a single click, whilst retaining whatever features are already on the figure's material zones.

And the answer is Shader Spider.

I, too, need to do the same thing, and have not figured it out completely. For simple trivial existing shaders, adding a Blinn into Alternate_Specular is no big deal, but what if there are already things plugged into Alternate_Specular. Shouldn't you be able to remove them too? Like suppose you want partial shaders that apply Glossy versus Blinn. Clicking both, you'd get Glossy AND Blinn which is not desirable is it.

There are limits to what a partial shader can do, and generally it will be only additive. My understanding is Shader Spider can handle these things within  reason. Failing that, you have to learn to program it in Python, as I'm doing.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)