Mob trainimg

For this i think it would be fun if you could craft/find special books that look slightly different than enchanting books and they are specifically for mobs that are friendly or at least neutral. These books would change the behaviors of the mob you throw the book on. For example one could be a patrol book which will cause that mob to walk around the area where it was trained auto attacking aggressive mobs, however you can no longer get that mob to follow you unless you have another training book 'follow'. Some books will just swap out behaviors while others are just to allow mobs to do tricks. And just like enchanting has curses some books are negative like aggression which will make that mob attack all other mobs. We've been able to enhance ourselves and builds why not our pets and other "friendly" mobs or ruin another player's day.