Configuration gui standard. Usually there is a config file that I am suppose to edit as root and usually done in the terminal.

There should be a general gui tool that read those files and obey another file with the rules. Lets say it is if you enable this feature then you can’t have this on at the same time. Or the number has to be between 1 and 5. Not more or less on the number. Basic validation. And run the program with --validation to let itself decide if it looks good or not.

The user can choose. Please note you first much accept another client by its fingerprint.