This is a feature request, I believe. It would be very helpful to have the configs provide more ways to tweak the spawners. I'd like to have more variation in quantity as well as types (create spider buildings, blaze, etc). So far the only option is to have it on or off which isn't enough granularity for what i'd like to play with.

Thanks!

There is actually a lot more control if you go and edit the assets themselves. There is a full json based asset system and you can basically tweak almost everything with that