Unfortunately there is currently no way to have a slideshow loop. It would seem to be useful to add, up near the top of the screen on the right of the toolbar. There is a send feedback button. Click that and make that suggestion these go straight to the developers.
Peter_VZ Verizon Support
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Even better, please submit this to the Verizon Idea Exchange, where it can be voted on by other customers and is also seen directly by our developers. The Verizon Idea Exchange is there for you to submit your ideas and suggestions to Verizon so that we can consider them as we innovate our products and services.