I'm not sure to call this a feature or a bug, but if you use the Move to Next Monitor key (CTRL+WIN+X) when the start menu is open, it moves to the next monitor.
Repro: Win, Ctrl+Win+X.
Cute -
I am running Windows Vista SP1 with all fixes applied to this date. Display Fusion v3.1.5
Darn, I was hoping it could be a new feature. It seems like it's got to be useful somehow. At least if you wanted to implement the start button on any monitor, you know you could do it!
I played around with duplicating the start menu on the DisplayFusion taskbar, but there are many, many issues that I ran into. Don't worry about the beta testing, you're already in the beta group so you'll be notified of the start of a new private beta. In the meantime, you can try out the public betas: http://www.binaryfortress.com/Forum/index.php?topic=1310.0
The latest one should take care of the start menu bug.