I have attempted to add the CommonPart to the User ContentType, but it errors out. I believe the reason is because when the admin user is created, CommonPart is not instantiated.
Reason I am attempting to add the CommonPart to the User ContentType, is so that I can add the Multiple Address Module with a unique constraint. Similar to how Comments ContentType utilizes the Container Type. Is there another Container Type
that can be used for a user? I would believe installing Orchard would still error because the user content type still cannot instantiate this new container type.
This brings up a problem then when attempting to add items with n-n relationships within the user content type. I believe the CommonPart should be apart of the User ContentType when installed for auditing purposes.