Okay we have almost all been in the situation where we are trying to trace the edge of a 3D geometry body that the sketch plane is flush with. For example look at this picture:

Now, try to imagine tracing a sketch line/curve over the edges of the bodies in that 3D geometry. You may notice if you have a keen eye that the sections of the circles are actually part of a concentric mix of curvatures. That is, each curve shares the same center. Finding the common center is the only way to trace the edges of these 3D geometry bodies. Now, if fusion 360 had the ability to activate a tool that traced the edge of the 3D geometry that is in contact with the sketch plane then it would really resolve a lot of complications that people run into when trying to trace edges and match curvatures. Photoshop as a magnetic lasso type of tool that tracks edges of colors and so forth. So in the same sort of way I'm thinking it would be good if Fusion 360 could trace surrounding 3D geometries from point to point much like how the arc tool works where you click a center then one point and then draw the line over with your mouse to complete a circular path. Yet, the geometry may often be very complex so the edge tracing ability would have to be intelligent enough to know what plane and edge it is really tracking.
Thoughts? Opinions? Maybe this would be a big improvement to the program. Heck, they are always updating every 2 weeks why not throw this idea in the mix.