Robert,
I noticed several of the same things recently on a long XC I took (VA to Nova Scotia). Personally, I agree that the drop down window for setting the time zone changes is WAY too small. However, I'd like to see a user selectable option for the time to change automatically when crossing time zones, or to stay as set.
The map change function seemed a bit "clunky" to me. It always waited until I flew off one map and *needed* a new map. Personally, I'd like to see this be seamless so the user never knows they're changing maps. Its always nice to see what's coming up and in this case, other than what you can recall from flight planning, every map change is literally a last second surprise. This feature has room for improvement.
I too concur that the 720 is pretty darn remarkable for price.
Don