I've wondered about this too. The biggest problem I see is you would only be able to play on one piano in your LIFE, and would have to learn that method right from the beginning. Finding a teacher would certainly be a problem, and obviously any performance or competition on other instruments would be out of the question. Too bad, a piano is just not that portable! You would need to read the music inverted (sort of) as well. Not quite as simple as just playing a left-handed guitar.
I see no reason why a left-handed mode couldn't be programmed into a digital.
Here's an idea: build a piano with high notes on the left and low notes on the right, and play it like a normal piano. what would it sound like?hmmmm donjuan