I think I am understanding this somewhat, but so i dont make a mistake and mess up my true PVE config, if i want high walls and barricades to hurt players, would a say under rules "highwalls can hurt players" and "barricades can hurt players"? and if I want fire to not damage players bases would i put "fire cannot hurt buildings" ? thanks

yes. just save a backup and do whatever with the config then it won't matter

Ok, Thank you!