@supermarcel. Thanks for posting.
Ok. Easy Folder Listing Pro (EFLP) has the capability to show files in that are unique to a user. How is works is that you point the listing to a folder, and in that folder will have subfolders of the usernames relating to each user. And you may also specify a subfolder for guest users.
I also offer a second product, Easy Flash Uploader, that can upload files to user specific folders. So they can work together.
The only thing that EFLP can’t do automatically is to give other users access to their files. So, that particular aspect may not be possible. You could have a specific page that only the admin can access that lists everything, tho.
Hope this helps.