[Mr V]

How about a quick and simple appendage that can herd balls. A couple of pieces of polycarb that form a V that are flexible enough so you can ram balls against the barrier and force them over. Just don't make it so big that you could accidentally herd more than 3. In this years game with a low number of balls available a bot that can get balls to your teams scoring side however it is done could be very valuable. Even just keeping balls out of the opposing alliance's reach could make a difference in the final score.