Hi Hax... Here are my suggestions
My use pour your extension would be to sell downloadable pictures on my futur site....
I thing that the download part could be made easier. Some other extension are more easy to use for that but I find that your way of handling the basket and gallaries is way better. Look how WP eStore handles the downloading part.
Also the private area needs a little bit of work. It isn't easy to setup of the username and password.
The pictures doesn't show on my front end but does on my back end.
I didn't find anything in the forums to solve the problem. So I'm waiting for your next version.
You have a great product continue your hard work.