Hi Neil,
We don’t have anything specifics on copyrights on our site, so I think general copyright law applies here – if you submit an image and make it clear that it’s under copyright then you are protected.
As for the others, we appreciate your feedback and are happy you find our software useful. The main issue we have here is that the models in the software are not simply rendered images of a 3D model – they are heavily postworked, often hand-painted, so it’s not just a matter of taking multiple shots of the same models or items from different angles. As I said earlier, we have a few things in mind, but I can’t promise there’ll be any steps forward in this regard in the near future unfortunately.