Gmail is set to auto-add contacts I frequently email to the chat pane on the left of the Gmail webpage, and I like this. Every now and then, someone gets added that I don't want seeing when I'm online, but maintain contact with and don't want to block. Is there a way I can simply remove the authorization automatically granted to the user to chat with me and see when I'm online so that one of us has to invite the other to chat in Gmail?
