You can go to
http://maps.google.com, zoom in to the area, right click the map, and then select "Report a problem".
Also, see this post for information about using the "Straight line" mapping mode:
http://www.mappedometer.com/forum/viewtopic.php?f=2&p=1251sandrobe wrote:There is a walking path around a pond near that I cannot select on the map when creating a walking path. Is there somewhere to request it be added?