It would be helpful to at least to have a tab where we could see the users that are currently assigned to the container role being edited. Even if we had to go back to the user object to modify their assignment or membership.
I am working currently on a project that is available to all users but with different roles. When initially created there was a need to have multiple agent roles. We are now consolidating functionality and simplifying the agent workflow. The problem is with 70 agents in the project, I have to go in one agent user at a time to determine what role is currently assigned and if it is one that needs changed or not. In version 11 there was a role membership page where you could assign new users to a role.