Cannot fully agree Power, but good observations. Many would argue that coach M gives his QB's too much leeway. They always have several options and we are usually calling in coverage schemes. With that code our QB has the option to call a number of plays, to audible, pull the hand-off and usually 2 or 3 receivers, you are spot on that he is only recently improving on the latter. Up until this year, Davis needed every play called in. Even Mays was given at least 2 options on every play when he stepped in. Usually it was 3, as he has a bit more mobility.
I like our mix of under center vs. shotgun. In fact, if it was not so cold I would prefer more shotgun. It matches with our smaller TB's. However, like you, generally I like under center. At the DI level that is not always practical.