Inf range phoenix feathers don't work on xml edit.
I'd be assuming 1 charge fb is hard to trace. Only way they could ban you is if another player catches, reports and provides legit Nexon screenshots to a gm, where they would investigate your account about it. Otherwise, they wouldn't do anything at all about it and if you're soloing dungeons with it, you'd almost never be caught unless a sudden gm pops in and catches you. But again, that's a way too slim chance and any right minded player would stop doing it for a little while if a gm is near.