[rsisk]

How about a minibot that is released from the main robot into an area that cannot be reached by the main robot. It could then release bonus game pieces onto the field to be scored by either team. Minibot could be autonomous or remained tethered to the main robot.

The area I am envisioning would be a small (clear?) tunnel the minibot would travel through to reach a switch or lever which would release the other game pieces.

By allowing all teams to score with the bonus game pieces provides strategic options of when to release the bonus pieces.