On the subject of toon shaders. NIghtsong, published a series of 2 and 3 tone shaders on Runtime DNA. There was a black-and-white option, she called noir shaders. I don't see them offered any longer. They allowed integration of transparency and color maps. She still has a presence here and she can be contacted at mwilliams@worldhavens.com. Attached is an example. I decided not to use, and went firefly and then superfly instead.