I have simple suggestion that, as far as I know, hasn't made its way into tactics games yet. Instead of having entire maps be either fog of war or not, have maps that have areas or times with FoW. For example, part of a map may be covered in literal fog that would make it a FoW area. Another example is to have the FoW come and go with a weather or day/night system. It seems like the game is pretty far along, so incorporating this into main campaigns my not be possible. However, I would very much like to see this sort of option be incorporated into the game; at least for the map editor.