It would be great to have a feature where individual Members/Users can hid their account from the Directory, ie, like Hidden Groups.
If site admin made of Profile Type of say, 'Shy', then conceivably Members/User could use that to hide from the Member Directory.  Site admin would just have to find a way to let Users pick their type, or inform the site admin to make their Profile Type to 'Shy.' Â
It would also be useful if Users could have more than one Profile Type, like it was a Category or Tag.