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I have a HTPC hooked up to a projector that I use to play movies, and the projector has native support for 24 FPS, so I use this:
http://nircmd.nirsoft.net/setdisplay.html
to quickly set framerate. Make batch files for 24 Hz, 60 Hz, etc. bind them to keys, and then you don't have to bother going into a display settings GUI.