Disabling Keyboard shortcuts in Wheezy (Gnome 3)

[Andrew Wood <a.j.w@me.com>]

Hi

Im having a problem disabling keyboard shortcuts in Wheezy with Gnome 3 
/ Gnome Shell.

Ive gone through all the ones in the list in System Settings and set 
them to disabled, yet pressing the Windows key still switches to 
activities, and Alt-` still switches between open windows.

How can I disable these?

Thanks
Andrew