Where can I change the worldType of a dimension I create?

I create my dimensions with:

            DimensionManager.registerProviderType(id, GenericWorldProvider.class, false);
            DimensionManager.registerDimension(id, id);

In my own GenericWorldProvider I can change worldType in registerWorldChunkManager() but that seems not the right spot (or is it)?

Basically where can I set the worldType to (for example) amplified or flat for a dimension I just created? I would like the dimension to have a different worldType then the overworld but I don't see where I can influence this during creation of the dimension.

Thanks,