Honestly dont think this is needed. If you believe you've been rdm'd you check the logs, if its marked bad action then sure and you can just straight up ask him next round or when he is dead. A decent player would admit his mistakes and perhaps slay himself. If not and he keeps rdm'ing just get an admin or make a player complaint about him.
My honest opinion this isn't needed at all, sounds to me like you just want to make a shortcut with the plugin and not just straight up ask him for his reasoning.