This mod can be used by modpack developers to distribute default options and keybindings without overriding user changes on every modpack update.
Instead of shipping the options.txt directly, you will ship a "defaultoptions" folder in your modpack which contains the defaults previously saved through the /defaultoptions command.
See Getting Started for a modpack author guide and the expected folder layout, and Troubleshooting if defaults are not applying the way you expect.
Forge
Fabric