Thank you very much for your thorough replies.
Yeah, it's pretty surprising that it doesn't have thumbnail changing built in depending on your option choices. It is pretty standard practically everywhere now. And super important for certain types of products.
Hopefully someone can come up with an easy modification for this. I can't imagine that people who sell clothing for example, can be happy about thumbnails not changing based on color choices or design variations.
I'm not sure if this will fit my needs unfortunately. It really may infact just be too basic. This one functionality alone is very important for how I'd be using it.
We're selling collectables of varying condition. People need to be able to select the quality grading available, and then see actual photos of the product. We can't have 30 different listings for the same product just to get around this limitation. Not only is it logistically unfeasible, and a headache for customer navigation, it's gotta be really bad on SEO.