I would to add elements to my lightboxes
As near as I can tell, choices for customizing the lightboxes (the pages that show individual photographs) are extremely limited. The picture can only be displayed in a size that fits the viewer's entire screen. Titles and captions are only displayed on top of the image itself; there is no way to add titles or captions as separate elements above the picture or to one side of the picture, even though there is plenty of room.
Here is an example from my PBase site. The title and caption are underneath the image. This is what I want.
I can't imagine that SmugMug would provide so many options for customizing everything else on a user's web site but would provide almost nothing for customizing the most important type of page.