I did have a workaround?
Yeah, rip the heightmap from the CPT file, and darken it in Photoshop - but be careful that the flat areas in the heightmap aren't pure black, as you'll hear water when running even when there isn't any water present. If anyone wants more info just let me know and I'll elaborate... However to make sure your maps are more popular I'd suggest using stock terrains as I don't think many people will be bothered to download your terrain with it.
I was actually in the closed beta team for DFX2 and one of the many assets I offered was a flat terrain (desert, jungle, and snow) but of course that never was even looked at (while everyone else's stuff was), so I've decided to contribute it toward our BO mod for DFX2.