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Open the System Preferences application and go to >> Security & Privacy >> Privacy >> Accessibility, then tick the Steam application. If it already is ticked it requires the applications and computer to be restarted from previous updates, such as the OSX Yosemite. I had the same problem for ages and was wondering why it didn't work.
If he does all of this, then he'll be able to use the Shift+Tab item within Steam Games, unless he's customly changed it within Steam.
P.S: Tell if you have any luck at all (or your friend).