I don't think lightmapping is very good for terrain, because you wouldn't get a very good resolution for large terrains. Outdoor scenes with large amounts of instanced geometry wouldn't work well, but not everyone is making Crysis. For more detailed interior scenes, this is great.
The workflow was designed to be easy and convenient. pureLIGHT exports an .sbx with accompanying .gmf files, along with lights stored in the .sbx. It's very easy to use, and fits right into the Leadwerks pipeline.