Made a model for a spreadable Mix (DX11.Texture Mixer) node.
I am just pretending there is a pixel datatype (using color),
hoping that someone familiar with hlsl could parse this into a shader.
Application examples of a spreadable mixer:
timeslicing
kinect user texture operations (they come up often in the vvvvorums)
Should be quite doable. From looking at your model I would not call it a mixer though- more a switcher.
If understand your patch would it be right to describe the shader you want as a per pixel switch between N textures based on a singe channel control texture?