@Dodo, yes, on the server, everything that is available with common or server affinity will be attached when the server boots. This is a provision to improve performance by not having to attach modules when needed in a controlled environment like the server. Usually, those YUI Modules will define things, instead of automatically carry on with an operation.
I want to learn more about your use-case, what exactly does the YUI Module is trying to do that it can't be automatically attached?
It is not really a use-case, I just noticed that when experimenting with a mongodbCRUDMojit.
I was creating a mongoose schema in an old unused module (bad) and creating again the same schema in a mojit model.
I'll follow your advice and will only define things in YUI modules.