Any chance of having alt-image tag editing at some point? It isnt just high up the SEO best practice list, but like all other aspects of SEO it evolves, and not only are they still relevant according to Google as recently as 4 months ago, but you should also be able to edit them as good SEO research spots new opportunities.
If they cannot be editable, product images should at least have the product name on the main image, but I cannot see this when I scrape my site?
With Google trying to leverage conversions from the image search pages, its pretty important if its not already present!
And you get (allegedly) a free page boost for following accessability best practice too.