Homeless, women or men in Underwear, shouldn't be able to call cops
There should be something that prevent the ped from calling cops (like low signal or low battery) Ped Should also has it's own wanted system (Other ped or Player can report a ped doing crime and the police will hunt the ped down) Also during Night at 3 Star, Police Helicopter need to Use Their Searchlight to find you During Night, you can use darkness as advantage for getting away from cop You should be able to kill cops stealthy without getting Wanted (like Manhunt, i think)
Cops takes time to report you (except their reporting time are shorter than ped) I like to see the Police AI a mix between IV and V with some Improvement But the Police has some flaws, so how would you like to see the Cop AI in Next GTA
Police is the most important aspect for the game, providing both realism and challenge for the player, And also get frustating or annoying sometimes.