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Perhaps Adobe will put this option into the Mac version when it becomes available.
Must be my day to be the Cynic of the Year...
I don't think Adobe cares a whit about PSE for Mac. It's purely a port, at best, of the Windows version and can't possibly have any quality testing done on a Mac. Adobe continues to program like many other Windows early developers, by building everything themselves, instead of using an OS's built-in API's. Sure, this reduces the number of API's they need to learn but it requires even more knowledge of how the cpu and its other hardware works. Or, maybe they just have a nice 'API convertor' that they never actually test! Either way, they don't want to put any more time/support into Elements for Mac, just no net ROI.