To elaborate, I got it to work this way:

  * Hold two fingers on middle of track pad
  * Click thumb on bottom of track pad; katamari should start to move at this point
  * Release two fingers on middle of track pad
  * Use single finger to move cursor while still holding down thumb

I tried that, but it works too slowly to continually press with two fingers next to the ball.

I meant is there a way to change the javascript to use a different button?