I tried this, too, because thats how they do it in the videos. (My friend, btw, never heard of this and was convinced it was wrong.)
All that happened was that when I moved my fingers, the keyboard would present me all the fancy accented characters that are bound to this key, too, but it wouldnt let me move on to the next key to the left/right. To be honest, though, I didnt try very hard. I was frustrated within a few moments and gave up. You see, I'm born in 1967: For my generation, a keyboard is something you dont even think about, you only use it... one of the few technologies that "just work". I simply refuse to learn how to use such a simple thing as a keyboard. Let the young folks play with it, they seem to enjoy it.