I don't know about the majority of mirc users, but some of us are in multiple channels, spanning multiple servers... and it gets to be a problem when your switchbar fills up completely and you can't see anything else as it extends towards the bottom of the switchbar.

I know this can be avoided, at least to an extent, if I put the switchbar on the top or bottom, and use three lines, but that doesn't look very good.. I like to have my switchbar on the left of the screen where everything is vertical. It would be nice to be able to enable another one, either by placing it on the opposite side of the screen and dedicating it to certain windows, such as DCC sends, messages, and other things that are not server windows or chat windows..