An idea I really liked is a sort of "capture the flag" element. It would be something that you had to trigger, and exists on both sides of the field (one per alliance). Robots would have to manipulate or trigger these, which would either be a bonus to them, or a penalty to the other team. This would cause teams to have to think much more about defense, and strategy would be a must to protect your undecided trigger thing
. This would also cause much more exciting matches.