Either way that works for you is great! I feed all my snakes in a feeding bin, but when they are taken out for cleaning and such, they go into a snake bag, so they dont think that another enclosure/container always means being fed.
Also, I do feed live to my ball pythons, but I NEVER EVER leave/walk away from them once the rodent goes in for safety reasons. My bp's eat live only, in the past I tried to switch them over to P/K or F/T, but they all quit eating..for months. My boa is fed P/K or F/T though, as he has NEVER had a live feeding, although, a long time ago, I did try a live mouse with him when he was a tiny little guy, his feeding response seemed very slow and he was not very responsive, like he was unsure of this thing that should not be moving that much, seeing as though he is use to P/K or F/T. He just would not mess with the mouse. Period. So I have continued him on F/T or P/K.