Working at a game development studio, I find myself doing a lot of sci-fi related items, concepts, interface mock-ups...
I use stencils a lot for hard surface / tech concepts. Unfortunately symmetry doesn't seem to care if I use a stencil or not. It doesn't draw the stencil shape in the mirroring, it draws where the stylus is.

This is frustrating because if I want to turn on radial symmetry to place 8 circles, stars, bolt holes...whatever around something it won't work. I have to copy and paste by hand, or hand draw them each separately. Not to mention, that if you look at the image below, you will see it doesn't obey symmetry, it only draws 1 circle and 3 stupid circles.

Click image for larger version. 

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Thanks,
We really love this program,
So we might put in more suggestions later