Adding colored traces
Adding colored traces to your services would be a win. It would be nice to see which part of a course you may have sped up or down on and have those changes marked by color. I find this to be valuable feedback about unconscious patterns I may be establishing, so then I could response to it if needed. Runtastic offers this feature and would be great to see Strava, who seems to have a stronger commitment to privacy, have it as well.