Another vote for auto-trace. I regularly need to convert the edges of bitmap artwork to vectors for use in cutting machines etc., I was using Inkscape, but I really hate it. I bought Affinity Designer in the sale recently, and gleefully uninstalled Inkscape, never to use it again. When I couldn't find the trace feature in Designer, I searched and found this thread. I am now in the process of re-installing Inkscape. Please Serif, add bitmap curve tracing, and save us from Inkscape hell!