I hadn't heard of it until you posted this and I did some (more than I'd like I guess) reading into it.
From what I can tell, for desktop users as a power saving feature it's pretty pointless, modern hardware is already quite capable of putting itself to an idle state to save energy, and saving energy is not that important for desktops anyway. The other "big" gain would be enabling the use of Intel Quick Sync encoding, though my own preliminary testing doesn't show that much of a gain (though I don't do enough video encoding to really know what I'm doing) and CPU x264 encoding still appears to be faster here.
For what it's worth, you could probably regain the feature by simply getting a license of your own, they offer 30 day trials as well: Lucidlogix Product List
However, if you're running Windows 8 you may not need to. Windows 8 allows for a headless iGPU (ie no monitor attached). If you set the iGPU multi monitor support enabled in UEFI while your monitor(s) are connected to the discrete GPU you should get another video device in your device manager. I had to then get the video drivers (they weren't installed yet) and now I have two graphics cards listed there, and the Handbrake beta with QSV encoding appears to work, though I don't see any speed gains, rather a loss. (I'm not sure what other free or trial software I can try to make sure it really works).