Years ago (2004?) I wrote a little command line utility that allowed users to alter their screen resolutions, bit depths and refresh rates. To be entirely honest I don't even remember why I did it in the first place. However it seems to have been somewhat useful to a handful of folks over the years. I still see requests for it and occasionally get emails asking if I've updated cscreen for the Intel machines. The answer, now, is yes. I even created a page for cscreen for OS X so folks can link to it as needed.
That said... I do not have a Retina display and do not know anyone with a Retina display, so I cannot test it on such devices. If you have a Retina display and wish to give it a whirl, be my guest. In fact, if anyone wants to provide any feedback, please don't hesitate.