Easier way to reorder the cities horizontally

Sometimes your order of cities may be "wrong" for whatever reason (or your priorities may have changed), and short of the extension auto-sorting them by time offset (which is not the case currently), you might want want to easily change their order. There doesn't seem to be a way to do this currently.

Ways I could imagine:

• Drag-and-drop across the panel (very cool but not necessarily discoverable)
• A "Move to the left" / "Move to the right" set of actions in the menu that appears when you click one of the locations in the panel
• Something in the extension's configuration panel to change the order (maybe a list boxes widget reorderable by drag and drop, like Nautilus' view's "Visible Columns" settings?)
  

In that line of thinking, a shortcut menu action to launch the extension's settings dialog from any location's menu could be great to have too.