I checked and although it's unclear to me in the XEP-0045, there are multiple issues with jabber room-names using uppercase, so I support keeping it lowercase.
Then, I don't understand why this issue is not closed :) Kune already does not allow you to create uppercase names for chat-rooms (*), and a chat-room name cannot be changed later on.
If it's not closed because the same limitation should be imposed in lists... well, I'm not convinced about that. Why using in Kune-lists the same limitations of mailing-lists? Unless some kind of retro compatibility is planned (pretty difficult) I don't see the point.
(*): I will clarify the message, specifying "lowercase" characters
Maybe others like list has the same problem...