The original IL-2 series had problems with shimmering in the distance too. One of its patches at least partially fixed it along the way, some time after Forgotten Battles was out. Even then, I found I had to adjust the Anisotropic filtering in my video card settings to reduce it further. (Turning down the filtering unsharpened and blurred distant textures.) I've tried doing the same with Cliffs Of Dover, but haven't noticed a difference. It makes me wonder if, like the anti-aliasing, the Anisotropic filtering is even working in-game.