I thought about including some sort of slider, but I figured there’s already so many great slider plugins out there, it would be better to make sure they all work with GP, and let them focus on creating great sliders, while I focus on the theme itself.
That being said, every well developed slider should work flawlessly with GP.
The place the slider below the header and above the content, you would need to:
a) Use the Page Header addon – simply add the slider’s shortcode into the “Content” section.
b) Write your own little PHP function that hooks into the ‘generate_after_header’ hook which includes the shortcode.