Just tested it. Does not work with DirectX11 games at all.
Did nothing for Dirt2, only plays the "tada" sound when you start the game. Force Vsync did not work, Tripple buffering did not work, show FPS did not work.
The only tool that actually does work with DirectX11. Worked for me in Dirt2 to enable Triple buffering is
ToMMTi-Systems SSAA-Tool v1.0. But there is some bug with it right now, when Triple Buffering enabled, after a couple of minutes there are artifacts of screen and the whole system freezes.

Looks a lot like it's burning the hell out of the video card memory.
So no real solution for DirectX11 and Triple Buffering until now.

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