Ok... after playing around with the panel, I found a workaround, but this still needs to be fixed. Heres how to get (bad) add to panel support: First, remove the Window Picker applet (yes, you CAN get this back!), and go to the home screen using the "Go Home" button. Now, you should be able to right click the blank space and choose add to panel. Add a seperator somewhat to the right of where you think the edge of the window picker will be when you have the most icons you will have open, and then add the window picker applet all the way to the left, aligned with the go home button. You should now be able to use add to panel on the home screen. This however, is a terrible fix, and I hope Canonical fixes the problem. It would appear that even though the window picker only takes up the space of the windows that are open, even when on the home screen, when clicking on blank space, there is no add to panel icon, because gnome-panel treats that space as "part" of the window picker applet.
Ok... after playing around with the panel, I found a workaround, but this still needs to be fixed. Heres how to get (bad) add to panel support: First, remove the Window Picker applet (yes, you CAN get this back!), and go to the home screen using the "Go Home" button. Now, you should be able to right click the blank space and choose add to panel. Add a seperator somewhat to the right of where you think the edge of the window picker will be when you have the most icons you will have open, and then add the window picker applet all the way to the left, aligned with the go home button. You should now be able to use add to panel on the home screen. This however, is a terrible fix, and I hope Canonical fixes the problem. It would appear that even though the window picker only takes up the space of the windows that are open, even when on the home screen, when clicking on blank space, there is no add to panel icon, because gnome-panel treats that space as "part" of the window picker applet.