I know this is a long shot, but the mod is pretty stable on 1.12.2 now and it's a lot of fun especially alongside mods like Ice and Fire. Would love to see it integrated into a pack as good as this one!

I assume this mod includes world gen? If so it would be incompatible with pre-existing servers, which would be an issue. In addition the pack is already quite heavy on the world gen, so I think Niller wouldn't be too inclined on adding more mods that add to it.

I think this mod could be cool, especially when Integrated and intertwined with other mods making it part of the whole experience.

Maybe if and when this is available for 1.14 we could have a look at it again for E4?

Agreed, Possibly for E4, but no for E2E :)