Depends on what they're trying to accomplish. Yes, they could have lowered the rate to 0.5%. But that would perhaps set off large-scale and sudden selling in the US dollar.
I agree that they have to do something. And I think the Fed should be open to monetizing not just financial assets such as securities, but also the plant and machinery of businesses. Especially businesses that are trading at a vast discount to their value (ie: oil companies) and produce valuable exportable goods (ie: oil).
We'd all be better off with the Fed holding a gazillion bad oil wells, than a gazillion bad mortgages. That's for sure. And I trust the people at ExxonMobil to be the nations new bankers far more than I would the Wall Street folks. (and XOM has a low-cost branded retail distribution network to boot!)
Back in the 'old' days, most banks were owned by producers, and run as a side business. Free-standing banks without some attachment and ownership by industry typically haven't been successful throughout history, simply because, in the really bad times, at least producers have assets to collateralize their operations..