I can work on adding a feature like this but it’s a lot of code and checks that have to go in on groups, and hosts. Perhaps, images would be better suited for ou/domain joining though i would prefer to see ou/domain management in its own format potentially as its own plugin. This, in my eyes, makes the most sense as OUs typically go with the domain being associated. The method used for the current ou system works by a single domain though you can keep in mind that hosts can be manually assigned domain/ou information. The “global” setting is just a quick way to set default information. It is by no means the only domain that can be used.