I think that it is important to note (although I'm not 100% sure), that the technology can be used to simulate hovers: getting near (but not "in
touch/contact" with) the MT screen can activate a hover animation.
I would doubt that even if the technology existed it would be easy to use. The concept of hovering near something to activate it would be alien to most people who arn't theremin players.
I'm currently looking this issue at the moment and my initial thoughts are mouse based navigation systems start to fall appart when you use your fingers. Left hand navigtions and drop downs don't work nearly as well and more main body navigation starts to make more sense.