I know it's an old and tired topic, but I'm just interested to know why mobile device artists (and developers consequently) prefer all those double and triple taps, tap-and-hold and other finger acrobatics of a performing piano player to a simple programmable ALT key. There are SO MANY THINGS can be solved by having it somewhere in the bottom left corner. Turning a brush into eyedropper or eraser, or smear brush would be the most obvious choices for those who work with two hands. Not very useful if you hold your iPad in your other hand though, but you can sure lay it down on your lap or afford a $20 mini stand. Haven't seen any app developer using it. Except, perhaps, for the Paintstorm. A powerful app, with interesting UI ideas, that, like many others, disappeared into the bug-infested heap.