Alternatively I could fix things in the very same scene.dat by setting following values:
No fog= 100% visible distance
Light fog=100% visible distance
Medium fog= 50% visible distance
Heavy fog=25% visible distance
This would solve from our perspective the game tendency to produce light fog, but would screw the IWO reports about weather, as he would say light fog when you actually can see at top distance. May be I could also fix that in the text file, changing the wording for the IWO report on light fog (visibility).
But of course the better option would be to have properly working fog in the game
