[Pharo-project] how to specify the loader type of a metacello project?

Hi Is there a way to specify the equivalent of project loadType: #'atomic'. at the level of an expression such as: (ConfigurationOfMoose project version: '4.7-flat') load while this loadType propagated to the projects? I saw that on a MetacelloMCVersion that there is a loaderPolicy instance variables and setters but there is no comment I have no idea what it is. It would be good to comment for real classes of the infrastructure we use. Of course MetacelloLoaderPolicy is not commented either. Sad. So apparently a MetacelloLoaderPolicy hold a loadDirective which can be a MetacelloLinearLoadDirective Stef