A feed-satisfy gun is my way of wording something that simply bypasses the need to shoot enemies to access areas by feeding them instead. So in terms of gameplay loop it is equivalent to shooting them so they despawn except it's just reskinned so as to remove the violence and its opposite would be a shoot-kill gun.
The rest I agree with you. I think it's an interesting idea. I would want some transformation of the gameplay loop so as to not simply reskin the violence and its place in a survival-craft game and instead integrate non-violence in a new fun way.