Thor has pretty much said it. Il-2 could have a few additional features added such as bloom, high dynamic range and self-shadowing (which are all possible with its version of OpenGL and DirectX) but the issue would be finding someone who is familiar with these older versions of the GPIs and is willing to work on them. It is unlikely you will as I doubt there would be any graphics programmer who wants to waste their time on an old game.
There is a Bloom effect mod that exists for DirectX8/9 games that works with stock Il-2 BUT you have to sacrifice perfect landscape for it to work.
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