I've made 2 mods which modify the environment files on the campaign map, getting rid of the awful blue fog that covers a lot of the map. The empire is most affected but I'll be working on the other areas in the future. Theres 2 versions, one that just removes the fog available here:
http://steamcommunity.com/sharedfile.../?id=879747177
And another here that adds some lighting changes and will eventually have much bigger changes in areas other than lighting.
http://steamcommunity.com/sharedfile.../?id=873964498