Title permission was introduced in one the recent client updates, and probably will be of use in one of the next server updates.
Guess, it was created to give certain groups/users (like guests) the ability to look at their own permissions if not granted to look at any users.
But why you need an extra permission for that?
Could you not make it so, that groups/users that have "b_client_permissionoverview_view" set, can view any users permissions and if not set you can only view your own?
Thanks.