It would be great if we could extend the CommerceMedia class and allow for custom properties. The text field group really isn't efficient for selecting what image type you have as the values here from content editors should be consistant. Therefore an enum dropdown select list would be a more efficient method of selecting what group an image belongs to.
In addition, we should be able to add translatable culturespecific description or title of what the image is.
Agree, this would be helpful.