How about you simply upload additional files with corresponding names to the same folder, so detailed image is img1.jpg and additional file is img1_lg.jpg
Then you can call on this file from /modules/Detailed_Product_Images/product_images.tpl using
[img]{$images[image].tmbn_url}_lg[/img]
Does that help? I'm doing something like that and using an image swap so clicking on the small image loads the large image into the page.
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