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It’s easy to have a lightbox popup come up rather than a detail page. On the Create/Edit Gallery settings page, uncheck the “Preview Photo via Page” checkbox (about half way down the page) and it defaults to the popup.
You can then set the popup size by using the technique Peter describes above.
Lightbox normally opens a window relative to the size of the browser window and contained within that window. Photo Seller’s lightbox is static and stays at the size designated either by the uploaded photo size or by using the Watermarked Max Preview Dimension field value as you suggested.
Is there a way to make the size of the lightbox popup dynamic and relative to the size of the current browser window?