Noel is right,

What this allows me todo is to first hit the hotkeys to switch input focus and then "Alt+Left or Right" to switch workspaces/desktops, It would be nice if I could simply switch workspaces w/out first having to use the VM hotkey to change input focus...

Possibly with the use of installed VMtools on the guest OS, it would be neat if you could setup a way to ignore all "Alt+Left or Right" key combinations on the Guest OS, and send those commands to the Host instead???