I don't think you "control" deflation. You have to destroy it before it destroys you.
As his QE forces long rates down, he has become the last and best greater fool for treasury buyers.
There is no guarantee that QE will force long rates down. I do think the idea of buying longer term Treasuries is silly. There is no shortage of buyers (yet) for those securities. Buy longer term corporates and MBS. Banks and other sellers will then invest their proceeds (some in Treasuries) and repair their balance sheets.
I'm glad we agree on that. The market isn't going to win fighting the Fed's QE, but nor is the Fed going to override the market if/when they don't need to. I'm sure Bernanke has every intention of easing up on QE ASAP. But I don't think he realizes the extent to which the market has been betting on his actions versus investing for long term growth. We will probably always disagree (me versus you and BB) on the value of credit to spur long term growth.