In your mod, really miss the optional ability to disable the spawn of all creatures (hostile, neutral and peaceful) in the "working" radius of the crystal.

Thats a good thing to have as a configurable option.
Although I dont see the benefit in disabling pacific mobs entirely (they can be disabled in vanilla by overflowing the pacific mobcap in the spawnchunks). Could be better to have a configurable list of mobs that should not spawn, with options like
#pacific
#hostile
#aquatic
#all
Specific mobs

I think fans of skyblocks will find it very useful to completely disable the possibility of all possible creatures appearing.

It has been added in the latest version (2.4.0) so Im closing the issue, thank you for the feedback!