It would be very cool and useful !
I think it isn’t necessary to pinch design at VRayBlend.
I do not insist 
But I think the meaning is clear.
Yeah, Corona Bland would be cool. But I bet it’s on Keymaster’s special list and will be added soon.
Yeah. Blend material with changable presets !!!
Like this:
Base layer: preset: chrome, cooper…
Secondary: Scratches, dirt…
Layer…
Layer…
Layer…
This feature would be really really great. There are some features like rusty metal where this is so useful
+1