I mostly think it feels odd that Flamethrower doesn't generate Heat. AoE battery spender would be nice, and I like the suggestions of giving a buff after using Air Anchor that lets Spread shot generate it for a few shots. They just can't let it generate it in a burst else you might use it in single target.

Heck, this would be a bunch more work so I don't think they should do it, but add the Noiseblaster or Chainsaw as an AoE version of Air Anchor, and Bishop as the AoE battery spender.