Some users lamented the loss of the UseWorld() keyword/resource, used to add customobjects to a biome from a list defined in the worldconfig. We could implement a new feature based on that functionality, and let users define resource groups in the worldconfig that can be linked to from biomeconfigs, to add a list of resources with one ResourceGroup() keyword/resource.

Fe, worldconfig:

ResourceGroup(
"WarmBiomeResources",
Plant(..)
CustomObject(...)
CustomStructure(..)
Tree(...)
)

Then all warm biomes would have in their resourcequeue:

ResourceGroup("WarmBiomeResources")