My answer to "Is it possible for moderators to filter or control the posts before they are published?"

This is my answer to a Question on Support site for LampCMS project

RIght now there is no such feature. Moderator can only delete or edit post but there is no feature to "approve" a post.

This feature can be added pretty easily, probably with very little programming, just have to set the status of new posts to "deleted" - deleted posts dont show up on the site but moderator/admin can still see deleted posts and can 'undelete' them, so this will be exactly the feature you looking for.