Interesting idea.

I have been meaning to set up some sort of chat room when I get some free time and have to do one for a project anyway so may get round to doing this at some point.

As others have pointed out. Allowing users to simply to choose a username and go will leave it open to all sorts of spamming/harrassing/name stealing. Would have to be one of those 'PM for access and an account with your femdom forum name will be created for you' things.