Is there some way to use multiple workspaces or desktops?

Under Configuration Center -> Shortcut Keys, there are bindings for "Switch to desktop N", for N = 1..4. But when I bind those, e.g. to ctrl-alt-N, and use the shortcuts, I stay on the same, original, desktop.

Multiple workspaces/desktops would be very handy on this machine, given the small screen size.