How about a dual pair of Exotic Submachine guns that run off of Super energy? They could go in your heavy slot or secondary slot and picking up ammo for that weapon would charge super as well as orbs? It would be balanced because super isn't generated immediately, so you wouldn't really be able to start a match with it and even though it would carry through after death, it wouldn't be as powerful as conventional heavy weapons so it would balance through that. Plus it might finally rid the world of panic-supers.