Which of the four methods are you using to make your slideshow?
Or are all of your stills already on the timeline? If so, sometimes the easiest way is to Share/Personal Computer/AVI to output the slideshow as an AVI. Import that AVI into your project and use it to replace the stills on your timeline -- then use Time Stretch to lenghten or shorten it as much as you need.
Yes. They are already in the timeline. I obviously wanted the show to run a little longer. I will try your suggest and let you know.