When an application is made full screen (F11) it is not possible to show the hidden panel touching the screen bottom with the mouse pointer. Tried with Firefox, Terminator and Gedit. Is it the expected behavior? Cinnamon 1.2.1-0.2.git7c2c952.fc16
Yes, that's full screen, you're only supposed to interact with the application itself in this mode.
Is it just a design decision or is there some complexity in making it otherwise? Because I'm talking about a hidden panel which only shows when provoked.
Try to think about using virtualbox in full screen mode. If the panel bounces out everytime you access the virtual panel, THAT would be a bug.