I used to do that, feeding in a seperate container. Simply because thats what I was told yeeears ago. I did it for years, until I got to a point that I have 50+ snakes, the simple time factor made me stop.

I cant really say that theres been a difference. I have 2 mean ball Pythons that doesnt matter what they are in, they are grumpy and could strike(ironically got them both from the same guy and a few others that werent healthy, they werent taken care of properly). I feed in their cages now, and I havent noticed a change in any of my snakes.

But do what YOU think is right, and what works for YOU.....and good luck