I like the callout suggestions! Perhaps a hit and run callout in which you have to secure the scene and search for a suspect vehicle that a witness saw. Maybe also a callout about an attack on a vehicle or property damage/arson where you arrest culprits/search for suspects in an immediate area and deal with the incident (FDLC response/tow the vehicle). Maybe an assistance callout for an officer being shot at, attacked with a knife or in a pursuit. If you sift through the police scanner callouts in the game files using Spark/Open IV, you find many potential scenarios.