Comment by narag

I found it infuriating and clumsy.

I've heard about programs that tried to do that before that had massive usability problems. Your comment seems to confirm that diagnostic.

I figure if this would work for any language it would be Lisp

I guess it would be more of a novelty for other languages.

I found shifting my hand off the keyboard...

That's a big no-no!

EDIT: By the way, I've been experiencing something similar recently, teaching Scratch and AppInventor to my son and a group of children at Coder-Dojo:

http://medialab-prado.es/article/coderdojo

Kids like the mouse interface, but I do find it very limiting and slightly infuriating.