Shift already exist as a native component, as @Volker_Rakow explained.
I was thinking about the context menu where you already have Flatten, Graft, Simplify, Reverse and the analogy with Graft and what is the meaning, cutting back the new layer, so I used Ungraft to use something self-explaining, as the first guy I saw taking about it here, but I have to say Stunt is very nice too