Not sure if there is a way to do this already or not. But I find I need multiple of the same stencil at the exact same size fairly frequently. Especially when working with Symmetry or trying to make seamless tiles. At the moment I just zoom in real close try to center one on top of the other and scale it down to the size of the other one. I know its not exact.. probably ever. It just seems like a lot of waisted time and effort when a simple "Duplicate stencil" option or an option to set stencil size to whatever percentage could make it about a 1 second process. Well I say "simple" but I'm not programmer so I have no clue how hard or simple this would be. The idea seems simple though.