Ability to shadow ban a user. "Tachey goes to Coventry"

Effectively what this does is to make the posts and any of the content from the user not visible to anybody except admins and moderators. This gives them the impression that they're still able to post and interact with the community but they never get responses. This helps in situations when you have someone evading bans or removals from your community and they use other means to get back in, such as changing their email address.