No way to get a marking tool into the lines of the ShapeCut (unless maybe if you use a pounce pad -- haven't tried that). I put the sandpaper dots on the bottom of mine so it doesn't slip on the fabric. Works great!
Ohhhh.... wait, I just realized that "slick" can mean both "slippery" or "amazing". If you meant the latter, then dots aren't needed & congrats on your wonderful find!