I think that would be cool. I try never to do any of my shadows at 0,0,0 just b/c I hope some day we'll be able to do this. (I know that some slip through b/c I forget...
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I would like a totally different layer that would work like the alpha blending overlays for the viewport (i.e. the auto-darken feature) but would allow me to substitute a color of my choice or load a graphic to be blended; with the latter you could do clouds or dust storms or fire...
