Accuracy aside. What do you you if you need to look at your keyboard to find an unfamiliar symbol. I can touch-type fairly fast but my error rate goes up dramatically when typing non-alphabet keys.

What would be neat is if you could bring up the tablet keyboard through a gesture, like clapping your palms together, select the unfamiliar symbol, gesture to remove the keyboard then continue.

Although I like the idea of something like this, I can't imagine myself using it for a long period of time.