cannot add shortcut to switch to desktop 2 when apps are fullscreen on 10.8.4
Full screen apps do not count as a desktop.



So if you set up looks something like the above, you can not switch to desktop 2 because there isn't one. What you have is one Desktop and two spaces.

If you want to be able to switch between full screen apps, without cycling through each space you could change your Mission Control settings.



By checking the highlighted box you can switch full screen app spaces by using the command+tab keyboard shortcut.

Also, in order to create a shortcut for Desktop 2 you need to have at least two desktops running open before you open System Preferences.