Terrain decal road/path, grass/tree variation painting - MAX Easy Terrain
Download MAX Easy Terrain 0.87: / plemsoft
How to use and view path as decals (new feature), make mud tracks or anything you can think of.
Powerful variation painting of grass and trees (new feature).
The procedural generated terrain mesh can still be imported into blender or other 3d editors if you want to add additional geometry to your roads.
When importing your mesh decals into GameGuru MAX , remember to set them to "no collision" and select "transparent", Enjoy :)