IM not sure about this becouse ive never tried it out, but there is a file in Art somewhere that shows fog of war and maybe if you blanked out all the black spaces there you could make the "fog" transparent. That is the game would not understand that it isnt, becouse the fog of war tiles would still be there just transparent, but you would be able to see through it.
As i said never tried it out. Could work... hehe