In The Disney Pixar Game Ratatouille, How Can I Control The Ball To Smash Bugs?

You obviously get around the same way as you walk.  It is tough to get used to, but you can try tapping the keys instead of holding them.  My method of choice throughout the whole game is RING FINGER, MIDDLE FINGER, POINTER on my left hand in order on A, S, and D.  This way I don't need to look, W is just one above the S and my hand walks/rolls him anywhere...(the ball is tough, my son and I can roll along edges but we still fall once and a while)

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