If you hit c by accident you can just hit ctrl+z and it'll bring you back to your last joint state in the match.
You're welcome.
It's possible to create new key binds via scripting, but I don't think you can change a key that's already assigned. not sure if its really necessary or how it would be implemented, everyone had to get used to themselves not pressing c q:
It could be in the setup option. Setup >> Keybinds.
Then it could be somewhat similar to the minecraft keybind system.
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Plus, people hit c by accident sometimes. It just happens.