Called before the configuration.converters are activated

def extra_prepare(self, configuration, args_dict):
        """Called before the configuration.converters are activated"""
        aws_syncr = args_dict.pop("aws_syncr")

        self.configuration.update(
            { "$@": aws_syncr.get("extra", "")
            , "aws_syncr": aws_syncr
            , "templates": {}
            , "config_folder": self.configuration_folder
            }
        , source = "<args_dict>"
        )