I have too much but my main set are:
Use some of Maddens features e.g
NFL Superstar=NBA Superstar
The deep gm stuff like what tlo said with the food pricing and ticket pricing and stuff.Create a team.
Slow down the gameplay a lil not like 2k though.
Also i would take that collision **** off or redo the whole situations.
Make things different in the NBA Dunk contest.
Have create a shoe and be able to sign shoe contracts in superstar mode and being able to get to buy stuff like crib on the 2k series but buy things nba players really buy like cars,gear,stuff like that..... I may post the rest some other tme.