I really like the image gallery, but...
I think there should be more options for what the images link to, such as to nothing, and to an external location. I like using the shortcode, so if these options were included in the shortcode, that would be really useful.
Also, I think the support article should explain how to find an image's attachment ID. (I know how, thanks to a forum thread, but I think that would be very useful information in the article, considering many people have asked about it and the information is not forthcoming anywhere else that I can see.)
I think both of these would be relatively simple modifications to what you already have going on, but they would make a big difference.