This is a deal breaker for me also, I had a router before that I forced DNS to make work instead of loopback but that is so messy and I have multiple external domains now so really need this, it's bad enough that you can't get a static IP on infinity but I could live with the hassle of that for the loopback functionality.
Glad to see BT have time to moderate but not actually provide an answer...
Sorry I haven't posted in a while, I have received some more feedback from some of you and have been passed it on.
Thanks to those you advised of their own personal experience and what they want from their router, I have forwarded these on to the Hub Development team.
I am still chasing this up and will update when I have something more concrete for you all.