Quoted from lyonsden:
I've be using this feature on their beta release and absolutely love it. You keep alternating balls and when done, you can go do something else rather than wait 30min for someone to finish their turn. Also, I like it as you can add a new player on ball 2 or 3. So if you do end up with a stack of extra balls and another person is finished, you can add another player for them to get three more balls and keep alternating with you.
just wait for someone to get confused. Now add choose next player now