I think Blizzard could care less about what or how many buttons you press as long as there isn't automation in the sequence. If you press two buttons at once or 10, they don't care. But the moment you put a delay in the button presses by using 3rd party software (or hardware), they'll ban you. If you have a 3rd party application that presses buttons for you while you get a cup of coffee, they will ban you. Seriously, read what the GM said in the link in the second post.