Path "brush"

Add a new terrain/object brush category allowing patterns to be placed following a clean path, using multiple points with curvature options between them.
This would make the painting of paths cleaner than when using a mouse, but would also allow "directional patterns" and even "animated patterns" that would follow the direction of the path.
Edit: Have an option to change the width between each points
Like a rock paved path would not have large rocks going vertically, or a ruined asphalt road would need some visible lines.
Animated terrain brush would allow flowing water streams, or even sea waves going a specific direction.