I think it would nice if a shot early or late would hook or slice (or draw / fade - depending on how early or late you were).
It would penalize a poor hit more, but could also be used intentionally if someone wanted to work the ball. Currently it's still a straight ball flight regardless, and that varies greatly. In some spots you can miss by quite a bit and barely get off the intended line, in others you miss a little and go way off. Same with wind...sometimes an 11 mph wind has almost no effect, and others a 3 mph seems to push the ball quite a bit.
A few more club options, especially AW, would be great.
A putting green would be great.
A muligan option for practice rounds would be great.
In the old version, if I remember right, the scorecard when finished had the option of displaying your lowest possible by hole. It currently shows the total of your lowest, but not what the number is per hole. Certainly a lower priority than many other things, but I did think that was a nice feature.
Fantastic game overall!