I don't use gnome-do but do use kupfer which is much the same minus the mono.
I can use the commands plugin to set a super+space shortcut.
Survives a reboot.
Im using Saucy.
Be warned though, I have found previously, shortcuts set in the commands plugin to just disappear for no reason
and using super+space seems to have focus issues when the kupfer window is brought up.
ie typing is not being sent to the kupfer window.
Dont use the key combo myself....prefer Rctrl+menu.
EDIT I can solve the focus issue by using wmctrl to focus kupfer.
eg the ccsm command....
Code:
kupfer && sleep 0.1 && wmctrl -a kupfer
Something for you to have a look at anyway.
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