There’s a bug somewhere with gnome-do‘s key binding set up interface. It wouldn’t let me set <Control>space as for the summons action (which I’ve used pretty much since the down of time, or at least as long as I’ve been using Quicksilver on Mac.) At first I thought it was a conflict with an existing short cut, but I couldn’t find anything mapped to that key combination.
After some digging, I found you can edit (all?) of gnome-do’s config from gconf-editor. Just navigate to apps > gnome-do > preferences > Do > Interface > AbstractKeyBindingService > Summon_Do and type in the value <Control>space. The other stumbling block that was that you need to shut down gnome-do before the configuration changes from gconf-editor to stick.
With that out of the way, now I can back to dialing in my fresh 14.04 install.