How do you make gnome-shell get out of the way in fullscreen apps?

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http://askubuntu.com – I mostly like gnome-shell, and much prefer it to Unity at this point. (In reality, both are greatly lacking in polish.) However, when using fullscreen applications, I notice that the hot corners do not go away. This is most notable in VirtualBox which I need to run to access windows programs for my job. The gnome-shell notification area covers up the bottom pixel of the entire UI, making the windows taskbar largely useless-- you go to click anything, then need to mouse up a tiny amount for windows to actually see the click. This behavior is particularly annoying. The [Windows] key also fails (HowTos)