work-around for the absense of "save-as" in OS X 10.7
I'm afraid not. You could, though, add a shortcut to the Duplicate command, to make it more like the Save as. To do so just:


Go to System Preferences / Keyboard / Keyboard Shortcuts.
Select Application Shortcuts and click the add button.
Set it to All Applications and enter Duplicate as Menu Title. It's case sensitive, so make sure it's written with a capital D.
Choose a keyboard shortcut and hit Add.


Mountain Lion, by the way, has the Save As command back. Holding down Option while clicking the File menu, will turn the Duplicate command into Save as....