Never really thought getting another would be too useful, not as useful as it would be to change their tactics during battle.

The tactics changes could just be a command you gave too, wouldn't require new menu options. Usually when you have the computer (in this case, the server) control one of your party members, you are given options to change their tactics on the fly, it would be great to have at least a few predefined AI patterns for each role that you could change like that.