Currently, the only way to restrict a user's behavior is for users to block other users, or to ban them from the space entirely. There need to be some intermediary steps there, especially for public events like conventions. I would suggest adding the ability for moderators and up to restrict certain actions on a user-by-user basis, such as the ability to use voice and video chat, and the ability to message other users privately. Tying these restrictions to either the IP address or to an email would both work. It would also be useful to be able to do this for an entire role at once.