I think I might have figured out how to have heal and balance it. What if the healing starts to heal a set amount of HP when you get a kill? That way you won't sit in a corner all the time. Level 1 heals 10 per kill and heals slowly. Level 2 heals 15 and heal moderately. Level 3 heals 20 and heals fast. What do you guys think? Let me know. I hope the developers like it.
It shouldn't be hard to balance, but one problem I can see is a Jedi/Sith spam with this. Though maybe letting force only users have it might not be a bad idea, as it seems the only real trick they get for using force only is the explosion and extra powers, and it could maybe help them survive more then five seconds against a gunner. Unless of course the player is one of those MLG quick-snipe-360-noscope-swag-dew type people which can win any fight.
Maybe a medic class wouldn't be bad, since if one was added the CIS/Empire faction could maybe get an assassin type class, as it would fit into the style, and could counter the medic, seeing as a medic class should be very weak for being able to save others from death. It would make sense for a class that can counter an under-guarded medic, but still have a higher chance to kill one then a gunner vs four Jedi defending one. With what ever option could be chosen, it would need some balancing, but if the class route is taken, I think an assassin for the other may be a nice balancing point.
But this is just my opinion.