That's good to know. I went looking for associated scripts but couldn't find them, I need to look a little harder
Maybe if I elaborate on my ideas, it might prompt some more discussion and ideas, I think it will be useful to many people. This is something I've done in DarkBASIC Professional, and would be fantastic if I can achieve it an editor thingoid.
I call this concept Rails. It's nothing new, I'm sure lots of engines use them. The main rail is your road, track, river, whatever you need. It's made as a C-spline so it's very flexible. Each node has 2 handles which you drag around to form the path.
Now you can start adding secondary rails, that run parallel to the primary one. The first could be used to contain walls, another for street lighting, and so on. As you fine tune your primary rail, each secondary rail repositions to suit the first.
Does this make any sense? I'm talking about making a road/track system that is intelligent enough to simplify the design process. If anyone has manually laid down a road they'll know how powerful such a system would be to any terrain editor. I can possibly post some screen shots of the DBP prototype.