Limitation of NDB or fixable? User.is_staff login to Admin console

[dho825]

From what I understand, the reason that users who are marked is_staff() by Django's auth models cannot log in is due to Django having a m2m relationship with Groups and Permissions and throwing the error since JOINs are not allowed.

I'm wondering if this is actually fixable in theory so that it works out of the box? Or do most people just forgo the admin console for any Users besides superusers and build their own admin portal specifically for User groups and Users with subset permissions?