In using Django-nonrel, I have used ListField and EmbeddedModelFields.
But when I register the models with admin.py, I do not see any separate input fields for fields in a model which is "embedded" in to another model.
I see that using models.ForeignKey gives the result but with a loss of EmbeddedModelFields.
I am using the latest(git) version of Django-nonrel, djangotoolbox, and django-mongodb-engine.
I think if we want to do this, make a custom widgets to get "inline input boxes" and a form subclass to get the desired fields in admin panel.
Rather add testdata through mongo shell and see how it is displayed in admin.