Gnome-DO: enable <Super>space key in Unity without disabling <Super> key

I found a trick to enable use of <Super>space key for gnome-do without disabling <Super> key in Unity.
Simply use ccsm (compiz-config-setting-manager) to bind the command "gnome-do" to key "<Super>space" in tab "General->Commands" (I hope is the right english name, since I use italian) and enable the "Commands" tab.