It adds the same controllers you use to move other joints around to the fingertips and tongue, so you can control them directly rather than using morphs. A video's on the to-do list...
I'm already VERY into this as a concept! Dunno about tongues, but Finger controllers would be LIFECHANGING for my stuff!! I'll keep a very close eye and this and wish you the absolute BEST of luck developing this!!
It should... The demo video was done using Timeline. If you haven't tried loading as a session plugin before anything else, I'd recommend that first. Otherwise if you post how you're using it I can take a look at some point.