Bump.
Sorry to be a pain, I'm really just wondering if this method is possible. Vertex alpha terrains are not loading any more than the base texture in DarkGDK (looks like DarkGDK doesn't handle vertex alpha values automatically), though if someone has any information about that, it would be much appreciated as well, at all, in my experience and the base/detail texture method will not really be preferrable, since I have a need for multiple terrain objects (if I need to change the detail texture, there's suddenly a seam).
How are all you folks making terrains with roads running through them and those sorts of things?