It's a mod that I've started playing with and it's really cool - it essentially removes the game's vertical limitations so for example, Moria could be a single huge structure instead of a ton of warps. The main issue right now is that Cubic Chunks saves the world differently than normal Minecraft so it isn't compatible with Spigot, WE, Voxel, MCEDIT, or pretty much anything else that deals with world files and hasn't been modified for CC compatibility. There is only a semi-compatible branch for WE at the moment, however, MCEDIT and Sponge are being worked on. The CC devs also say that it is completely possible to make other world-editing and file-handling MC-tools compatible as well. The CC mod is also open source and since the devs aren't interested in porting every single MC-tool themselves, other programmers are encouraged to make a branch for their favorite tools and the CC devs have a Discord server with a large community to offer help.

Anyways, I think this would be a really cool thing to use on MCME.

Here are the forge links if you want to check the mod out: (CubicChunks alone leaves no caves and only stone generating below y=0, but it is also far more compatible with other stuff.)
CubicChunks - https://www.curseforge.com/minecraft/mc-mods/opencubicchunks
CubicWorldGen - https://www.curseforge.com/minecraft/mc-mods/cubicworldgen
MalisCore (GUI for world-gen) - https://www.curseforge.com/minecraft/mc-mods/malisiscore