In VS 2008, when the caret is on the name of the class which doesnt have a using statement in the file, SHIFT+ALT+F10 will bring up a context menu to add the using statement.
Is the same function possible with Coderush/Refactor Pro, only using the CRTL+' shortcut? Id CodeRush/Refactor Pro doesn't support it out of the box then an Addon would suffice.