I somewhat know how the act system works for stuff now, so I can definitely do something on this at some point in the future.
-Fire damage disables all services in the room. Bartenders ain't serving in the middle of a charred husk. Stores ain't selling product while shit is being picked up.
-Macguffin like timers to clean up a fire. Yeah, it would take about ten minutes of cleaning up to "fix" the aftermath of a small fire. But yeah, you're cleaning up. Feel free to RP out cleaning up while you're mechanically cleaning up.
-More serious fire damage would require a tool of some sort. Like the one being mentioned. Though mine was more standard gear like wrecking bars or sledge hammers to pry up burned boards to perform or light construction work.
-I was going to suggest maybe Falco Construction sell actual construction materials that are needed to repair fire damage. Something you can send an immie to go get or something.
I can see people just allowing fire damage to accumulate around the map if a specific tool is required.
Timer would probably be the idea I'd throw my weight behind, if only because it's a bit disappointing when the fire is suppressed and damage cleaned up before you can even walk across the map, sometimes.