I've noticed a small problem with the plugin.
I selected the "Image is pre-selected" radio button in the main button settings, and disabled the "Show "Pin It" button on this post/page" checkbox in each individual post. This allowed me to place the "pin it" buttons next to each image in the page "manually" by using the "image_url" shortcode.
This all works well, except that the "pin count" is the same for every picture on the page. It seems as if the logic is selecting just one of the pictures and showing the pin count for that one.