Up to nowlist_display does not follow foreign-keys.
I don’t have enough time and knowledge to implement this. But maybe a crowdfunding
campaign could raise enough money to pay a developer.
Do you think this would be doable?
Related ticket: https://code.djangoproject.com/ticket/5863
Related question: https://stackoverflow.com/questions/163823/can-list-display-in-a-django-modeladmin-display-attributes-of-foreignkey-field