Allow site admins to edit user details

Hi All,

I've got a fairly restricted multi site install and we need to give site admins the ability to edit users.

I realize that out of the box multi-site only allows super admins (for security reasons + users may be members of multiple sites) but in this scenario users are nearly always part of a distinct site.

So far I have tried creating a new role (e.g. Admin Plus) with the "manage_network_users" capability but that doesn't appear to do anything.

So..has anyone had any success allowing admins to edit users and if so can they share how? I understand it will most likely be a core modification.

Thanks in advance.