For what it's worth i'm GSM crew and have never refueled on the i/b sector either SFB-BFS or SFB - GLA on the 757.
And also have gone GLA - SFB nonstop a good few times on the 757 too.
GLA - SFB definitely not possible nonstop without ETOPS but SFB - BFS/GLA definitely is have done it in the last 2 weeks.
Also for all who are travelling with us in the near future, where we lack in ETOPs and refuleing stops etc we more than make up for in onboard service. So at least you will be very well looked after when you're onboard.