Back when the KSG was 1st announced back in January of 2011...that's just about the 1st we heard. Why not make it semi-auto? A Kel Tec engineer spoke to us about it, but he stated it probably would never happen. I'll try to find his exact answer for you.
<edit> When asked "How about a semi auto version?" The KT engineer over at another forum posted "There is always a chance....but pump comes first."