Why make a static dueling server and take up more space when someone could just do /jo duel and have a personalized dueling server open for an hour or so. Opening your own server is not that big of a hassle, and with your own servers you have the freedom to do whatever you want. I don't know how often a static dueling room would be used simply do to the fact that their is no set host, and all the rules and settings are definite. I am sorry to say that I can not support the idea due to the fact that anyone in the community can host their own dueling server.