World composition and Splines?

So, I currently have 11,720 tiles set up correctly.
Some even using RTV properly, which for the gaming area is performance magic.

I need to figure out a way to import landscape splines.

I don’t really see a way to do this in the “vanilla” landacape tools. Does anyone have any suggestions or plugins perhaps?

If not, I guess I can try and hook up something with Python.
The API docs actually seen to cover it…