Build able defenses/small structures for the engineer. So on the engineer team right now there isn't much to do besides all of the vehicles like repairing and destroying them. However I think you can add a hammer and blueprint as a utility/gadget that can be used to build defenses and weapons for points. The points would be gained from damaging players/vehicles, killing players/vehicles, playing the objective, reviving, repairing vehicles, healing and supplying players. Examples of items that can be placed are sandbags, smaller walls, small structures like tents and pill boxes, spawn points, small watch towers, machine gun emplacements, tow/anti tank guns and anti air guns.