I'd like to suggest some improvements to the online list.
There should be a possibility to display the request URI so that one can debug the "unknown location" message.
Furthermore, it would be great if one could see if a user sees an error message or a board closed message. This is kind of confusing when you disable the forum and a user or guest tries to access a thread. The user does see an error, but in the online list, you would think the user sees the thread.
For error messages (such as "you cannot view this because you are banned" or access error), this would be a plus, too.
And lastly I'd suggest a possibility to display the user agent, so that you can see bots that are not yet known as bots.