Anyone had done some brainstorming on zen-photo sideshow? How to traverse single album photos with Ajax?

Pre-loading all url's into array is not scalable, if your album have more then 100 images.

An older stopdesign theme variant had a slideshow as a custom function, if I remember correctly.
Please add a feature request to the trac, we will then add it to our poll.

But if you have the time to do it yourself that will be welcome of course...:-)

Using Effervescence Plus and setting the appropriate theme settings in the options tab you can get a slideshow or the thinkdreams theme has a slideshow function as well.