found this plugin called peaceful rage, stops all caps rage and replaces with peaceful messages. maybe a weird plugin, idk you look at it http://forums.bukkit.org/threads/chat-peacefulrage-v1-1-stop-all-caps-rage-and-replace-it-with-a-peaceful-message-1185.37337/
Kinda cool, but max doesn't really like plugins that aren't needed. If someone uses caps, they just get muted/kicked/banned, depending on the situation.