I would also like this back as an option. When I initially installed AS2012 this was the first thing I noticed since I was flying in an area with a 300' ceiling. Until I found this thread, and re-installed the haze texture the visibility was so unrealistic that I was about to return the product! Having added it back everything is fixed. I absolutely needs to be selectable in the UI. It would also be good if the "Visibility smoothing" could be enabled for non-DWC weather control systems.