Hey this is a very useful tool you have created. It so easily to build a track for a racing games. This was the feature I missed from CS4 (splines). I hope Leadwerks will add this into 3DWS itself.
One thing I noticed tho that it creates quite low quality heightmaps. For example check the attached picture. Roads are very bumpy. This does not affect the exported OBJ of course but on the other side 3DWS does not directly open OBJ so there is a need for a converter which is another small problem. Anyway very nice to see that someone made this.
Cheers,