[Answered ]-Django m2m queries, distinct Users for a m2m relationship of a Model

Not in your current model. If you want to have explicit access to the joining table, you need to make it part of the Django object model. The docs explain how to do this:

http://www.djangoproject.com/documentation/models/m2m_intermediary/

The admin and other django.contrib* components can be configured to treat most fields the same as if they were just model.ManyToMany’s. But it will take a little config.