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.
You can bind a keystroke to any refactoring (or CodeProvider) by supplying the display name of the refactoring in the parameters box of the binding.
You can also use Ctrl+. in Visual Studio to show the "add usings" context menu.