It wouldn't require too much coding I'd imagine. I can't speak on behalf of Mike, but XMG (Xen Media Gallery) was rather recently added to the XenForo brand as an official product (XenForo Media Gallery), so perhaps in 2.0 we'll see more options for it.
I'wouldn't be as categorical as you are Chris about this request being "quite niche". It's photography related and when you have a look on the web you can see there are tons of forums dedicated to photography.
I'm not saying that what I'm asking for is needed by every photo forum owner, but for sure there is a need for tools specific for photo website. You can see for instance that there is a real need for a good photo contest solution. And, AFAIK, it doesn't exist now. What I'm asking for is a direct consequence of this need.