As to #7, the sliding sleeve on the extended magazine - I slid mine up a little, put a drop of Gorilla glue on the flat side of the mag body, spread it a little with a toothpick, and slid the sleeve back down over it. Left it like that for a day to dry and no problems since. It was easy, and since I already had the glue, cost me nothing. If it comes loose I'll just glue it again.
The issue may be a little short sighted on the part of S&W but certainly not a deal breaker in my book. It's not near as big a deal as the grip safety on the Kimber I once had that didn't work.