I know that this reply is rather late, but afaik you can’t add spawns without needing to recook the entire map. You can’t cook individual sub levels. As for the crystals and obsidian you can’t directly change them without also recooking the map. But perhaps theres a actual respawn rate value somewhere you can change instead that isn’t reliant on parameters referenced from instanced actors. The issue with doing that though would be that you would still have the initial resources spawn as normal, but respawn slower afterwards. Perhaps providing a early game boost then dwindling resources as the server runs. But then the resources would reset after the server restarts.
I like the idea of redistrinuting resources though to make the gameplay more interesting. Would be cool if certain areas of rare resources became highly contested, fostering more tribe v. tribe warfare as groups attempt to control resources.
You might want to look into modifying AI of some creatures as well if you want to make the gameplay less static.
As a suggestion I would change the name of the mod though. Ultra-realistic doesn’t make sense in the context of what changes you are making and doesn’t describe the mod well. Perhaps something more like “overhaul” would be more appropriate.