...has a virtual user feature. If you set up a secondary "passwd" file (which can be used along with your existing /etc/passwd file for registered, "real" users) you can have FTP logins that do not require a corresponding user account.
You'd have to create appropriately secured (chmod'd) directories to serve as file transfer locations. Download-only directories are easy to set-up without worrying about ownership...just make all the files read-only and the directories read+execute.
HTH. :D