Hi, I work on Route 53, can you clarify; are you seeing a problem from your registrar when you try to move to Route 53? We're also always keen to hear about features customers would like.
It's definitely on our list, but in the meantime there is https://code.google.com/p/route53d/ which will let you translate an AXFR/IXFR from a bind server directly into Route 53 authenticated calls.
