This sounds like something Smurth would have done :)

Some ingredients to a hypothetical solution:
http://www.litestep.net/index.php?section=4&action=view&catId=7&id=1184 http://www.litestep.net/index.php?section=4&action=view&catId=2&id=2268 http://www.litestep.net/index.php?section=2&action=details&id=343

If you choose to use TaskbarLines 4, that would have taskbar3 wrap after 4, making scrolling horizontally an interesting idea maybe?