Crowbar Man is going to see if he can disable Hey0's admin mod so that people can join. However, I don't know if the server has been updated yet, hence why you may be getting an error when trying to connect. Probably not going to work, but he is going to look into it.
As for duping, I'm making an effort to try to find information and I'm going to ask our server host (why didn't I think of that to begin with) if it's harmful at all. In the end it all comes down to what Crowbar and all of you think.
If you would like duping, please explicit explain it here, if not, then please say to the contrary.