It should be extremely easy to do, which means you could download the source code and do it yourself. Modders and source port devs work to achieve their own goals; if your goals are different, it's worthwhile to learn how to download the source code, open it into an IDE (like Visual Studio), and modify and build it on your own. For simple things like changing the tone mapping function, little to no knowledge of programming is required, so it's pretty accessible to newbies.
HarbingerDawn
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