Export two Models from your Modeler. The first Model with the uv-map you need for the colormap. The second model with the uv-map you need for the lightmap.

Open the second model in MED. In the Skineditor go to Export->SkinMapping. Then you have your second uv-map available in a text-file.

What you need? The posibility to import this text-file as second uvmap in the first model.