Okay, I have an idea. Instead of having to put a bunch of grass objects in a meadow and plains and such, why don't we do grass maps?
Okay, here is what I think. There should be another terrain map, called he grass map. White for least grass, and black for most grass. So, you edit your terrain map, add another layer to it, and color over it. Then get rid of the terrain map, and save the grass map as ____grassmap.png? 'Cuz seriously, it gets on my nerves to have to take a week, just to add a bunch of grass in realistic maps. (And I know you're gonna say, "That's what grass texture is for", but seriously... it just looks like FLAT grass...)