It will be great to see how you solved the problem of analyzing initially existing materials (they can use any channes like diffuse, or alt_diffuse, specular or alt_specular, reflectivity or not, displacement or bump or both or none of this...) Variants are so many, which have to be conserved and combined with the layers, really this is a challenge...

Indeed :-)
The trickiest bit was how to handle transparency: sometimes transparency is used to remove a bit of an object (a torn edge on paper, for example), and sometimes it simply refers to part of an object that is see-through (like glass, for example). When EZMat applies a plugin's shader it needs to be able to treat the two cases differently.

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