Simple: Just make the mode where everything is allowed, no rules in it (shooting, killing or complete mayhem and chaos) be default mode when people join, If people that want to play peacefully with their friends without being annoyed and interrupted, just write /fr to get in normal mode (no shooting and killing are allowed in this one) If those people from shooting mode get in to /fr and start rule breaking, that's when admins use their anti rule breaking system.