International events are often scheduled in Coordinated Universal Time.  It would be nice if the clock applet would special case this time zone and make it easier to add to your list of locations.  It's a royal pain right now to have to hunt for a location that falls within this time zone.  (If there's a better way to do that, it's not obvious.)

Not sure the best way to design this.  Perhaps a dedicated "Add UTC" button in the Locations tab of Clock Preferences?  (Button would be disabled if you've already added it.)