The script displayed on example is a batch upload processor, this is risky not only for the webserver but also for the client, as you need to give access to your HD inside flash, and this could bring to malicious actions from the code generated (you know, piracy, virus)

It would be possible btw to be able to create an import script that let you upload your files via FTP and then import them as attachments... we can see that process inside the ibparcade and some other systems.