Do whatever works best for you, there are many 'right' ways to raise snakes. I don't bother feeding in a seperate enclosure myself, I've always fed my snakes in their cages and it works well for me. However if someone else wants to feed in a seperate enclosure and it works for them, then who am I to say they're wrong? Too many people get bound up in thinking that there is one right way of doing something and it's just not so.