Hopefully I'm not just blind, but I couldn't find any options to change the behavior of magma or netherrack when rain hits it. This wouldn't be a big deal usually, but in netherrack and magma filled builds, you hear constant lava pops and have fire flying everywhere, which is a bit obnoxious.

I know that there's some way to use external config files, but after digging through the files it looks to be a bit above my pay grade.

Pushed v3.6.0.0 to CurseForge.

I am assuming you are referring to the Overworld particle effects on these blocks. Right now there isn't a way to turn this off in configuration. I would need some code to do this.