As stated in the 50 other themes on dual-monitors...LS handles dual-monitors...just most themers don't theme for it. The Gathering if acting like you described would be partially configured for it since the bar appears completely on one monitor. Now all you would need to do is add stuff over on the other side. As for your desktop size...you will need to edit your DesktopArea values so that it recognizes that you want to use the extra desktop space.