Of course it works on 9.10. We are talking about 10.4. I'm posting this from 10.4 Beta 1, where Alt+Space does still work. All they did was change the arrangem

Of course it works on 9.10. We are talking about 10.4. I'm posting this from 10.4 Beta 1, where Alt+Space does still work. All they did was change the arrangement. I use it to move a window to a numbered workspace. The Ctrl-Al-Shift-Arrows moves the windows AND switches the workspace. My use case is restoring my many Chrome browser windows to their proper workspace after restarting. Good point.