Just wondering! I came over to WP from the Drupal thing and some of the modules there could utilize an upload bar by using the Pecl library that is on most hosted servers to give an upload bar during the upload process. Could this be an option for your plugin? I know nothing of this library but once I asked my host to install it, I then had an upload bar for most file upload modules. I am just beginning to learn more on programming so I’m not sure how this may help or not. Just sharing a Drupal experience, and maybe something to look into.
Eric
