Hi Scott -
No, not with the built-in slideshow feature right now. It's something we're looking into but don't have a concrete solution right now. However you can do this with slideshows built with the Mag+ Feature Builder (feature.magplus.com). Those swiping slideshows will transition slides if you tap the edges of them, so you can just put buttons on each edge or make them part of the slideshow itself with a content mask.