Earlier this eve, we had a bot repeatedly join 19, spam a few lines, disconnect, reconnect moments later with a randomized name and hostmask, rinse, repeat. As a temporary fix for the issue, the channel mode was set to +R, which bars anyone with an unregistered nick from joining.
I think +R should be left on, as this is a pretty simple fix that will prevent it occurring again, as opposed to treating the issue like whack-a-mole and having 19 implode on itself while things are sorted. If +R is on, and someone attempts to join 19 without a registered nick, they'll see a message telling them they need one. If they're unsure how to register, they have Google at their disposal. If they still can't figure it out, then we can consider it a continuation of Waxx's initiative to weed out idiots and solve the bot issue in one dastardly stroke.
I'll be leaving it on for now, pending any objections.