"Stunning" a live rat is much more inhumane than CO2 or just straight live feeding. If you are feeding appropriately sized prey items, there should be no reason to try to "stun" the rat. Also, there are too many things that can go wrong. What if you have a snake refuse a rat that you decided to "stun?" Sounds like a rat suffering unnecessarily to me. If your snakes have aggressive feeding responses, why not just put the rat in the tub and let the snake do its thing? Just stand by with a pencil, marker, snake hook, popsicle stick or something to put in the rat's mouth if it starts trying to bite.
Feeding live is perfectly safe when it's being done correctly and responsibly. "Stunning" (aka bashing in a rat's head with the intent of injuring, not quickly dispatching) is inhumane and unnecessary.
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