At the City of Austin, our ArcGIS Online organization has about 700 users. Because of its large size, we've created a Department Admin role to help manage and share content. As it stands, in order for the Department Admins to share their users' content, they must first take control of the content, share it, and then re-assign content back to the user. This is very time consuming and inconvenient for Department Admins with many users. It can also make Department Admins uneasy, as they're constantly having to move data from the original owners to themselves and back.
We would like to suggest that a privilege for "Share Items" be added under "Administrative Privileges | Content". When enabled, this would allow the sharing of content owned by other users.