Very interesting proposal, goldfinger. Your recommendations look to me to be in line with what the dovish consensus is these days -- push out the tapering calendar, symmetric inflation targeting, no more IOER.
The criticism you probably get is that household deleveraging makes the main transmission mechanism of MBS purchases unlikely to work, because households simply won't borrow more. I think you need to respond to with some analysis of the residential and commerical mortgage and mortgage-refi markets. I haven't done much work on the US housing market so I'm not sure what the data says, but mortgage rates have been rising for the last 6 months or so IIRC.
But when asked why you taper treasuries over MBS, you have a neat little story. The FOMC already believes that the portfolio rebalancing mechanism mainly works through the size of the Fed's balance sheet, not the size of monthly flows - and the yield curve is already very compressed, so you can argue (as Bernanke did) that simply maintaining a large portfolio of treasuries will continue to reduce long rates and ease through the term premium. And then you can speak to tangible benefits from additional MBS purchases to the housing sector, where there is more policy space to increase consumption and investment in the short-term.
What's the value added of your inflation range to the Fed's current forward guidance on interest rates? Seems like all you're adding is that you don't want inflation to fall below 1.5%, but the last FOMC statement already highlighted that persistently low inflation is a risk, and they've been saying they'll let inflation get as high as 2.5% for over a year now. IMO, the market probably doesn't react to this -- inflation expectations are simply too well-anchored. The Phillips curve is pretty steep, even in the short run now.
And presumably banks are simply holding onto excess reserves because IOER is greater than their cost of funds... eliminating IOER may or may not induce greater lending from banks with the lowest cost of funds. The Fed's current belief seems to be that large increases in excess reserves are a consequence of LSAPs and do not impede its effectiveness, so you might have an uphill battle there.
You might want to add in something about the Fed's new fixed-rate, full-allotment, overnight reverse repo facility (which I think is still being tested). Like IOER, that is another tool the Fed can potentially use to have more direct control over short rates, which seems to be your goal there. Not everyone is convinced that reducing IOER would have the effects you think it does, so it's worth adding in other mechanisms to directly affect short rate, and the new facility is about as cutting edge as it gets.