This would be a huge help!

This would be ideal for adding extra information to listing images that can be changed by a simple edit and another upload.

Adding product specifics, enhancing promotions and even covering up old watermarks \ image overlays would be achievable. As well as getting products noticed more.

It would need to be done on an account basis. So rather than the overlay appearing on all images across all accounts, it would be selected by specific accounts. This is because the overlay would be fine on eBay, but not Amazon.

It has to be an editable overlay, though, and not permanent.

One way of doing it might be this: https://www.youtube.com/watch?v=RzJk2QgW8B4