[Mailman-Developers] mailman query

Hi, While working on postorius "Better User Settings Management" for gsoc i came up with few queries that i need to ask from core developers and barry.

1. Is there a way to filter the object of MailmanUser just like django have. (eg: to get distinct list_ids from mm_user.subscriptions)
2. from where can i get the possible values for each preference of mm_user.preferences.

Thanks in advance.

Thanks Varun Sharma