I'm also voting for this capability.  At a minimum, we need the ability to notify (email is fine to start with) someone with the Approve or Publish roles that there is something sitting in their queue for review. 

We have tried implementing an AWS SFTP location with Adobe Launch, which we discovered is not supported. From our support rep:"I checked internally and found that Currently 'S3 does not support SFTP Symlinks for Launch SFTP Hosts'. It is my understanding engineering is considering this as a feature ...