Out of all the things on my map that i have wasted the most time on it has been roads and grass textures.
Being able to line up the grass perfectly to the sides of the road and not having it go too far over the line is , in some areas , impossible without having the default texture on the left pop up. I think this is because of how the grass textures work and cant be painted in exact lines.
It would be nice if not only did the road have its own feature that "blocked" the grass , meaning that underneath the road would be occupied by something preventing the grass from appearing. but also a feature for putting different grass effects on the sides of the road entity itself with falloff width options. maybe even a side ditch option.