I think my answer is that you have seen a massively expansionary monetary policy in the last three years, and I can't imagine.... Well, I can imagine what a more expansionary policy would look like; it would have been U.S.-style or U.K.-style quantitative easing. But we have had expansionary monetary policy. It's still expansionary. It's not obvious to me that there would have been a big difference if the Bank of Canada had been following a different targeting system.
Also, I certainly agree with Craig that the current inflation targets were not constraining the Bank of Canada's actions.