I had the same initial reaction as everyone else--twist it faster, not slower. I had Kreiger make me a .270 barrel a few years back and they asked me if I wanted it twisted faster than 1:10 and I said no--I was happy shooting 130's and 140's then. Now I'm kicking myself because I want to use the rifle differently than when I first planned for it. When I shoot this barrel out I'll get a 1:9 or 1:8.5. I think you barely lose any velocity--maybe like 20 fps at these high speeds--by twisting it faster.
But...to each his own! If you love the idea of 1:11, go for it.
