Would like to have a built in tool to provide a more automated way of finding outlines of scanned in pencil sketches, i can't imagine this would be tough for the excellent programmers at PTC as even web pages can do this to some degree these days, e.g. http://arohatgi.info/WebPlotDigitizer/app/). Perhaps a pre-processing step would occur whereby the tool would suggest 'options' based on what it can see and how complex you want the result to be (e.g. did you intend to draw splines or lines etc). The user would pick a result and then manually finish off the sketch afterwards.