Strange request but for terrain would it be possible to implement a sort of material instance for the different materials? for example, one part of the map might call for brighter grass and another like a swamp might call for darker grass. Creating an instance of the grass material would allow multiple versions of it on the map.
Also, going to be honest, I preferred the more cartoony grass present in version 1.0 for a good chunk of my projects. The look of it was very nice, as was the blending with other terrain. Would it be possible to ship both as Cartoony and Realistic options for people to choose from? Other than that, the materials have come a long way and I really like how the update is shaping up!