I have no idea if this is even possible.
The great new benefit of the root, at least for me, is finally having access to Hulu/H+/ABC/CBS/NBC/Fox/everything-ever. Lovely!
The only thing I can think of that would make it even shinier, at least for a streaming junkie like myself, is somehow modifying (or replacing with an upgraded version?) the TV & Movies app to include the new sources.
In other words, I basically want to be able to go into the global Search, type in a show, and have it searching all of the streaming sources now available to me (rather than just, you know, Netflix, Amazon, and Crackle).
If this were to happen, and if Plex were to get their act in gear and have PMS results included in GTV search, my GTV box would pretty quickly go from being a somewhat unfortunate curiosity that happens to play Blu-ray to the JESUS BOX.