@jgcalifornia

Thank you for the suggestion.

The nearest thing at the moment would be to set showOpenButton="TRUE" to display the Open Image button on the gallery's Button Bar. When the user clicks the Open Image button, the current image would be displayed on its own in a new tab where the user could view it in greater detail.

The Open Image button normally opens the corresponding imageURL but if the image has been assigned a linkURL, then this will be opened instead.
Therefore, you could have a high resolution set of images and point towards them using the linkURLs.
linkURLs can be set on SimpleViewer-Pro's 'Images' tab.

I realise that this is not the same functionality as your suggestion but it might be a suitable alternative in the meantime.