Never mind, I've found a mod called Light Control from here:
May wanna add it to Curse Voice, I see his other mods there.
Using light control I've set minecraft:fire to a light level of 9 instead of its original 15 and cursed earth needs a light level of 10 or above to set itself on fire.
Makes things interesting as i can use light to push back against cursed earth to expand my territory without all hell breaking loose. :)
I'm building a personal tech based mod pack just for fun which creates a fort around player spawn and changes all other top layer blocks to cursed earth.
So far I'm using Dimensional Control to freeze the day/night cycle to midnight permanently and Biome Tweaker's "topBlock" for every biome's surface blocks replaced with cursed earth.
The problem come with fire due to it being bright enough to cause other cursed earth blocks to set fire to themselves and thus causing a runaway effect.
So is there a mod that will stop or replace fire?
Or is the a mod that can change the way cursed earth behaves?
Extra Utils configs are somewhat lacking.