Figured I'd share a feat I thought of some time ago. I think it would fit the game.
Overcharge (Guns ? / Electronics ?): Fire your energy weapon, consuming all its charge, and gaining X% bonus damage and Y% bonus critical hit chance per point of charge above the standard cost to fire the weapon.
Overcharge (Alternative): Fire your energy weapon, consuming all its charge, and dealing damage in a 3x3 AoE.