The light map is only a raytraced ligtmap. I couldn't find a way to bake GI or HDRI lighing in a plug]in. If I see a solution, be sure I'll add it to the next update. And lightmap are static images. But it could be intersting to render animated lightmaps as movies (as well as texture map and normal maps). If users ask for this option, I think I can add it. And lightmaps don't use objects arround for their computation. I think these kind of map are shadow maps. I'd like to add these to Baker in the future, but like for the GI or HDRI implementation, I can't see a way to easily do it.