Client Review Site - Project Level Security

We would like to see project level security settings for the Client Review Site. 

Our clients have very different security requirements. Some clients want all of their playlists secured by a password, while others are happy not to log in. 

Currently, we can enforce passwords at a system-wide level, or we can enforce a password at the point of sharing. Securing playlists at the system level is too restrictive. Securing playlists at the point of sharing puts too much responsibility on the production staff. Ideally, we could make project level restrictions whereby we can guarantee that all of a project's playlists are restricted to the individual client's preferences.