About the flat sun: by doing some research on the forum I found out about using SHIFT + PageUp or PageDown to activate / deactivate the sun glare on NVidia cards (which I have). It will bring back the sun glare but at the cost of overriding Antialiasing. So far I have not been able to find a settings combination in my videocard settings to solve this and I just can't play the game with those jagged edges
Now what I don't understand is that I can play the game with sun glare and AA settings both when I don't use the Widescreen mod...