Add more recent channels to ctrl+k dialog

I'm chatting in four channels, switching back and forth between them. Then I forget about one for a bit and by the time I think of it again I've forgotten the name of the server and channel, and I have no way to re-find it.

It would be really nice if the ctrl+k dialog would show more recently active channels than just one. Or if there was another interface for that, like the alt-tab behavior in many window managers that sort by recent access, or ctrl-tab in some tabbed applications.