with the plugin w3-total cache, in the overview of wordpress-posts there is the ability to "Purge from Page Cache" for each post.
this function is also available for users of the role "author". this is nothing to worry about if this were possible only on their own posts. but as an "author" you can do this also on other users posts .
so, is there a way to configure w3tc to not allow this for specific user-groups?