Protected content groups.
The S2Member is level-based which is powerful in one respect but limiting in another.
I have client scenarios where they want to protect content by user group.
There are various ways to accomplish this using S2Member (e.g. add a capability to all the content and assign it to appropriate users, or create a custom role and protect by role, etc) but none are intuitive and can end up requiring custom code or manual effort to maintain.
What would be useful is a UI that allows the selection of content that belongs to a group and a UI that allows the association between users and content groups.
This is not meant to replace the current S2Member model...just augments it.