Inserting node by double clicking does not work.  It might work after around twenty times.  Why can't you use the "insert" and "delete" keys?  This is a real pain.  Also would like to be able to continue trace by double clicking (or something) and continuing the track.  Right now I have two choices, move the end node to the destination, and then double click twenty times to add nodes, or, delete the whole trace and start over.  Very time consuming!!! Bob