I really don't see the reasoning behind terrain paints being restricted to a certain biome. In a game like Planet Zoo with so much creative freedom, this is inherently limiting. I want to use grassland grass in taiga, or tropical rock in temperate, or desert sand in tundra. This would make habitats look so much better, without having to be limited to the terrain paints of any one biome. Imagine how cool blending different rock, grass, or dirt textures from different biomes would look.