It would be very useful to have the option, to show the "Who is online" view without all banned visitors
i think that a filter "show all | no banned" would help to save a lot of time for manual filtering against the ban protocol
Aside from the performance issues potentially involved, that makes me wonder why there are too many banned members in the first place.
Are these spammers you've banned? Because if so, you'd be better off doing other things to keep them at bay rather than banning them.