At some point Garve would like to create the option whereby you can create a Gallery on a page, but tick a box to have it show as a slideshow. But until he can find the time...
Cycle Lite lets you create a slideshow, but to do so you'll need to edit your html in source mode.
You add a number of images within a container. In the example below the container has the class 'slideshow'.
<img alt="" src="documents/ss1.jpg">
<img alt="" src="documents/ss2.jpg">
<img alt="" src="documents/ss3.jpg">
Once you've done that, you need to tell the Cycle Lite plugin to do its magic on the contents of any container with the class 'slideshow'.
That should give you a result like the one below.