For dining, I'd recommend the following:
Sostanza -- try the butter chicken and artichoke omlette
13 Gobbi -- the peperoncino pasta is very good
Buca Mario -- don't remember what I had last time, but it was all good
As for shopping, I think you have most of the highlights. Looks like you've left out a few of the smaller tailors from the list (Seminara, Loris Vestrucci, Cisternino), but I think you know about those already. For RTW, maybe consider a visti to Happy...