Well there's destroying chests which spawn randomly (Yes, I got the idea off AoT), Mining certain brick types,
Picking up dropped cash items from dead monsters.
Running errands like delivering stuff or picking up items and delivering them at certain points, arresting cigarettes like you.
Killing things and picking up a quest item then dropping it off(Yes, It's not exactly original),
signing up for defending certain areas against waves of bots schedules a paycheck function and for every bot you kill it adds to the amount of money rewarded. (Still working on this)
Handing in items to bodies of power often rewards money or good stuff, and some other things which i can't be bothered to dig up.
Lets see you beat those.