The closest thing we have is the proton issues page where such things can be tested by the community and if a fix is found it will be made available in the next experimental version for everyone by default. The problem with a community patch system is that the issues that most games experience that have issues are deeper than just new launch options or the like. It would require a code change, and this would mean downloading a new version of proton for every game you have a community patch for, which will fill up a lot of space quickly. The ones that do just require a launch option or the like this would be useful for though, it’s just that proton is so good these days there aren’t all that many games that can be fixed so simply, else they likely would have been fixed by default.
The closest thing we have is the proton issues page where such things can be tested by the community and if a fix is found it will be made available in the next experimental version for everyone by default. The problem with a community patch system is that the issues that most games experience that have issues are deeper than just new launch options or the like. It would require a code change, and this would mean downloading a new version of proton for every game you have a community patch for, which will fill up a lot of space quickly. The ones that do just require a launch option or the like this would be useful for though, it’s just that proton is so good these days there aren’t all that many games that can be fixed so simply, else they likely would have been fixed by default.