This is a fantastic addition to increase difficulty. One of my first encounters was attempting to quarantine a section of forest to prevent further spread of an insane forest fire. This took approximately 1 IRL hour to get under control. By the end we had tons of wood and lost about 1/3 of the original forest including 3+ bee nests :(. All because of a surface lava lake. Also, the rain did not prevent spreading, only slowed it. 10/10 would love to experience in 1.18 as well.