The only other option that I can think of, and I don't suggest this lightly, is to contact an IRCop, preferably one that knows you, and ask them to use their access to temporarily remove the people that have been in the room for a long time, but not said or done anything (ie: the idlers). Some IRCops have this abiltiy, but not all, so even if you ask and the IRCop is willing to do so, they may not have the access.
I suggest you try the previously suggestions (ie: asking people to leave) for a day (or more) before taking this step.
