I was under the impression that the 4 desktops wrap around so you can keep scrolling sideways forever. Did I imagine this or is this true (if you can't, then that's number one on the fix list for me as far as I'm concerned) ?

I think it would be neat to be able to scroll up and down aswell as left and right, although that'd be a logistical nightmare. And honestly, I can't think of any good reason other than it being pretty cool.