Hello,
I believe the image gallery is based on the tttcompany's image gallery which used to be available for dnn2.x
I haven't tested the gallery but would like to announce some findings with the old version. Especially related to bots.
Read about the experience here
Quite simply, if the zoom-in, zoom-out, rotate & saturation buttons still render readable urls, it means for bots 1008 possible page combinations to crawl on. So a gallery with FriendlyUrls on and with 500 images, would eventyally have half a million possible indexable pages. And if the url parameters aren't always in the same order, we're talking about more possible combinations.
For the image management controls, I would suggest a javascript based links that bots cannot follow. Or then dynamically adding a META ROBOTS nofollow into the header. However, keeping the rotated images & other alternative views non-indexable by javascript urls, would yield to the most secure solution.
I still think the "next image" and "previous image" links should be followable. We just don't want bots to index the images upside down zoomed into perimeter as black and white (and so on...)