yes, you understand exactly what i meant. sorry for being too fancy with my words.
but you actually brought up a good point; i probably hold the tablet in a different way then others. so some may like to hold the corners, as you said, and others may like to place it on a table or lap or whatever.
in that case, having the whole left side move left, and the whole right side move right, may be a good solution for both methods.
the best ideas always seem to be the simplest ones.