Right now once T117031 is implemented if unit conversion is configured it is automatically used. We may want to have more fine-grained configuration, i.e. some option for disabling/enabling it, accounting for PRODUCE_NORMALIZED_VALUES and maybe other configuration values.
We probably need to configure rdf-builder-factory-callback for VT:quantity somehow depending on flavor flags. The problem is flavor flags are not accessible there and not passed to ValueSnakRdfBuilderFactory either, so we'd have to either add parameter or maybe modify $mode parameter to be more complex.
@daniel, any ideas on how to make it best?