First of all, apologies for not replying to your query sooner.
I usually get email notifications when new messages are posted in this thread but this does not seem to have happened recently. I will check my notification preferences.
Only the Pro version of SimpleViewer features automated slideshow functionality.
The SimpleViewer-Pro AutoPlay configuration options can be found here.
If you like, you could purchase SimpleViewer-Pro from here and upgrade the skin from Standard to Pro by following the instructions here.
If you want to create a slideshow using the SimpleViewer skin without purchasing a Pro viewer, then you could use AutoViewer as the default viewer (on the skin's 'Viewers' tab).