Here is a copy of a post from the beta domain on this topic.
joshhuggins wrote:Wow! Miguel what a great display / test! I would like to revoice an old previous wish for a miss distance setting for the contour search. Enter a miss distance (could be in In/MM or pixles) then when the countour search reaches a end point that's not closed it sweeps a radius around that point, if any points are within the radius, it measures the distance from the end point to each point within the radius and then "jumps" the gap to the point with the shortest distance. If there is no point with in the radius, then the countour is not closed message could appear. I think this would help a lot with those tiny little gaps that we can even zoom into enough to see . This doesn't really address the problem shown above with Miguels post because those items "should" be closed and not apply to this wish.
To add to this idea, if it reaches a point where there is no end point located, we should be prompted to pick a point to close the gap our self. The last point detected could be highlighted with the same marker used for symbol insert points.