@biopixel
the only place to edit the timeout value for slideshow, is in option>plugin>slideshow : modify speed value.
of course, you should configure other colorbox options of the slideshow (Colorbox image type, Colorbox transition, Mode).
of course too, you should use and configure colorbox plugin (plugin used with image and album for zpArdoise theme).
with that, you will have a colorbox slideshow on album page and image page : it is my personnal configuration on my website...
in admin>options>theme if colorbox is checked, colorbox will used to displayed the full image.
with that, you know all about my theme and the colorbox and slideshow plugins.
last, if you want to modify the php files of my theme, do that in the local files on your pc and after upload them to your server.