- Volume direct, Volume indirect, Volume color - It’s surprising that the Blender devs. have not as of now even considered adding this, as it seems to be too basic a thing to just leave hanging. Strangely enough, it’s not a common request in this forum either.
- Reflected / Transmitted Normal, Z, and Color information - Pretty much needed if you want to have advanced user-made denoising setups made with ease (as seen with it being needed for renderman’s new algorithm). Also important if you wanted composited effects to apply to everything seen in the image and not just with camera rays.
My ideas for now, when you composite, what do you feel is missing still?