A FEW IDEAS:
How about a Fire Investigator/Arson Investigation/Fire Warden unit. Technically, they aren't your First Responders, but, they are in use during Overhaul/Salvage operations to determine what caused the fire. It would have to require special education but it would probally work just like the police K9 unit in training and costs...
How about a Search and Rescue unit? Since we have calls like Building Collapse and Floodings, this unit wouldn't be a waste.....
New Police unit: CNT (Crisis Negotiation Team). Basically your negotiation tema when dealing with armed suspects who can present a threat to Emergency Services or civillians.