Regarding the glow caused by IDL, this is due to the shader producing gamma-corrected colors, and the luminance of these false colors being used for lighting pre-calc as well as final render. I wonder if there is some way for the shader to detect its use in pre-calc and during that phase produce linear colors. Hmmm.

I'm at work and cannot play, but I wonder if any other intrepid shader masters can experiment and see if one of the nodes can be employed to detect the pre-calc phase. Maybe one of the specular nodes won't fire during pre-calc?

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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)