Want to post images to Facebook, not links.

For my use case the current Facebook integration is not usable at all. It posts to Facebook a pre-defined image (set once for the Gallery) and "behind the image" it saves a link to the "real image" - i.e. the image of the gallery displayed when the Facebook button is pressed in the navigation bar. That kind of integration might be more suitable e.g. if you want to post information about a restaurant, then you would upload as image the logo of the restaurant and when you click on it in Facebook, it leads you the homepage of the restaurant.

For a photo gallery, I think the use case and customer expectation is entirely different - you want to upload a certain image to FB and share it with friends.

E.g. some Photobooth software has that feature built in so that customers can upload to social media directly after the pictures were taken. I would like to have that feature when customers browse through the Juicebox-generated gallery images of the images taken so far at the event.
Furthermore - during the event, on location, I have my own WLAN and Apache web server and the image link uploaded with the current Juicebox Facebook implementation does not exist after the event. So, when a user clicks the Facebook pre-defined image later on, the underlying link points to an invalid address.