When creating more complex materials, one of the most important things that I'm missing is a layered material, that we can blend different materials on top of another using masks or blend values like we have in VRayBlendMtl: https://docs.chaosgroup.com/display/VRAY3MAX/Blend+Material+%7C+VRayBlendMtl
Thanks for the suggestion! Layering materials is definitely something we’re considering.
Jacqueline Davis commented
Secondary materials/textures. I.e. if you have a metal ball, adding on a "water drops" secondary texture that can still have translusence and refraction without effecting the metal material underneith.