i think there should be:
a speedometer
you should be able to run out of gas and buy more
there should be animals, and children (at least teenagers)
to get cops on you people should have 2 call the cops or a cop should have to see it happen
more guns and weapons
more cars
bigger map
real cars like BMW or mercedes
you should be able to explore every building
you should be able you use people as human shields or kidnap people
running your own business would be nice
also, it needs to take place in present day. i'm tired of 80s and 90s crap
needs to be longer
cops should go after you for speeding and traffic violations
people should flip out if you pull out a gun
bring back spike strips and ability to rob stores
you should be able to get scooters skateboards etc
there should be natural disasters like wild fires and earthquakes
you should be able to see pedestrians doing something besides walking in circles (like reading the paper walking their dog or playing with friends)