Nope...

Lightmap needs a specific UVW (map channel 2) to blend with diffuse texture (map channel 1).
This is what WED do exactly when it build a level... But WED creates the second channel by itself.... I just wanted to control this process, or better... to do this in mdl files!!

is the diffuse texture UV mapped, or just tiled?

The lightmap will of course have to be UV mapped though.


I'm not seing what your problem/objective is here...

The problem is, that for texturing the UV coordinates are usually overlapping each other, they can be mirrored and the texture can be tiled.
For a shadowmap they can´t be arranged this way. This is because each mapped face will need a unique representation on the shadowmap - because the lighting of course doesn´t tile.

In another thread Jcl has said, that in a future update there will be the possibility for a second (different) arrangement of UV coordinates. This one could then be used for the shadowmap.
The other thing is, that there´ll be a possibility to include static meshes in WED, and the lighting would be similar to levelgeometry.

For me - at the moment - the best idea is to wait (and hope) for these features.