why am i the only person who uses this board

ur the voice of the people.

anyway, there is no plugin that does that, exactly, but there is a built in proboards account switch. it's all the way down at the bottom right of the screen: you should see an image like and you can click that to quick switch between all of your accounts on the forum.

there's also a link to where it is on my screen if you can't find it.