Ex Nihlo I think would be difficult to get balanced with the pack. I still haven't tried the server world gen yet, but the wasteland is full of dirt, which is easy to sift for saplings, grass seeds, and other resources that I'm pretty sure aren't meant to be so easy to obtain. Ore is similarly easy to get through sifting gravel.
The mod has a lot of things that would be interesting in a survival world, of course, but being designed for skyblock maps it isn't exactly balanced for them and I don't think it can be configured easily or changed by minetweaker?