A few items I'd like to see eventually incorporated into HFS:
The ability to logout, so that users can access their private directories and keep them private from roommates, as well as being to access private information from public terminals and friends computers. It looks like as of alpha 20 closing the browser window logs you out, but it would be good to be able to do it explicitly.
The ability for users to add comments to the files they upload.
The option to remove the port number from the URL in the Copy URL function. I use no-ip.com for domain redirection and port forwarding. No-ip.com adds the port number, so if it is in the URL as well it generates an error.
A Properties dialog for file and folder settings so I don't have to open the menu a dozen times or more for each folder I share.