No, forget XJJ2. Here's a better method. Start regular JJ2 and join a server. Then, start another copy of JJ2 with the commandlines "-server battle1" (i.e., jazz2 -server battle1). Battle1 isn't required, of course. Exit your server and then join the server where your regular player is. You can change your name in the player config, as well. Then repeat. And so on. And so on.