(I'm a bit rusty but I think this would work with almost/all id tech games)
I'd suggest making use of "autoexec.cfg" to include other configs in your mod, within "autoexec.cfg" you could add "exec resolution.cfg" and could then tell users to edit "resolution.cfg" to their liking, which would be easier with less chance of new users editing the wrong value. You could also setup "resolution.cfg" with the resolution values you consider to be a safe but reasonable, perhaps 1920x1080 as I think that's still the most common and should be okay for most performance wise these days. While "DoomConfig.cfg" has even safer/lower default settings.
Using "autoexec.cfg" in this way you could overwrite default settings without having to modify the config file, making it easy to revert to default settings by simply removing it from autoexec or even renaming the file so it can't be found.
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