There are extensions in /usr/share/gnome-shell/extensions you can copy those to ~/.local/share/gnome-shell/extensions but I think you will be better off just using the gNatty Pack and following the included README.
Pretty sure the duplicate applications are a a bug that isn't exclusive to the iso we're using. (I keep having to remember that there are slight differences between gNatty Gnome & Natty Gnome, though they function the same from what I've been able to gather so far)
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