Ok, I've tested this with making the change in a mutter gconf defaults and the shortcut works for all of the GNOME & Unity desktops.
Since mutter isn't translated by LP, the string "Launch Terminal" visible in the Custom Keyboard Shortcuts part of System Settings won't be translated at all for GNOME Shell users. Of course, by having the shortcut in metacity as originally proposed, it wouldn't be translated either by release date and this way at least less people are affected by the untranslated string.
Ok, I've tested this with making the change in a mutter gconf defaults and the shortcut works for all of the GNOME & Unity desktops.
Since mutter isn't translated by LP, the string "Launch Terminal" visible in the Custom Keyboard Shortcuts part of System Settings won't be translated at all for GNOME Shell users. Of course, by having the shortcut in metacity as originally proposed, it wouldn't be translated either by release date and this way at least less people are affected by the untranslated string.