I've been struggling with this for a while now and have seen some very complex JavaScript based solutions. I finally cracked it (for my needs anyway) with a minimal CSS solution.
Essentially you move the "overflow: hidden" from the slideshow element to a parent element that is wider, and then set a left margin on the slideshow element.
I've updated a JSFiddle for a fixed layout: http://jsfiddle.net/mledwards34/x89sQ/5/
.slideshow-container {
overflow: hidden !important;
width: 300px;
}
.slideshow {
overflow: visible !important;
margin-left: 50px;
}
and a responsive layout: http://jsfiddle.net/mledwards34/x89sQ/6/
.slideshow-container {
overflow: hidden !important;
width: 50%;
}
.slideshow {
overflow: visible !important;
width: 80%;
margin-left: 10%;
}