I have this feeling from dealing with the files beforehand that there is some way to turn creepers off, the same way I can mess around with the way some modpacks work. Is there some way I can for instance turn creeper spawn rate to zero or something? That would be lovely.
This is NOT a duplicate of the "how to stop creepers blow stuff up" questions. I asked how to make them disappear, and finally figured it out, using /gamerule domobspawn false to disable all mobs from spawning.