I think there's an effect type called destroy persistent, though I've never used it myself. Alternatively you could make the fire into a unit instead of a persistent, then you'd just kill the unit. The unit would need a behavior with the periodic effect being your search/damage effects that your persistent is currently using.
You're welcome. How much I further develope the idea depends on interest and feedback. For example I could incorporate bank file writing into it which would allow for things like upgrade menus being in the launcher. Or if I wanted to get really crazy, an over world map like in Star Wars: Empire at War.
Hey guys, I created a campaign launcher you can use in your custom campaigns. It's meant to be easy to set up, and easy for players to use, no longer requiring them to go into the editor to launch maps. Any feedback to improve the Launcher is appreciated.
Unfortunately Curse does not like .exe files uploaded, so I provided a Google download link on the project instead. Unfortunately you'll have to do something similar as well if you choose to use the launcher in your campaign. Luckily Google downloads are easy to set up and provide quite a bit of free space.