Give all city workers police powers. All of them. DPW, kindergarten teachers, librarians, lunch ladies...you name it. Raise property taxes and initiate a special tax for renters. Use the money to create a slush fund that will pay out settlements for beatings of innocent citizens. Also, grant them a cut of each ticket they write. Also they can write a ticket for whatever they want. Just make something up. They can write you a ticket for eating a ham sandwich in public.

I know it seems like I am changing more than one thing, but I'm just fleshing out the idea expressed in the first sentence.