I did at one point feed my snakes in a separate containers, but found that it seemed to stress them out. It would take them longer to get comfortable in the separate container before they would feed. I have now stopped this practice and started feeding them in their cages. They seem more ready to feed, and they take their food much quicker. Now this isn't to say that feeding in a separate container is bad but, I never saw the benefits. My snakes never seem to be more prone to snap at me when I open the cage.

It all comes down to what works for you and your snakes. Some snakes are picky eaters and will only eat under certain conditions. As far as it changing the snakes temperament, I found this to be not true. Hope this helps.