Hi Mark,
<Is it possible to edit one of the midpoints in the path that is created?>
I don't now if you can do that directly in GE-Plus (I don't have it). However you can edit the kml file in a text editor and change the coordinates as you wish. GE will take the lat/lon changes but I don't know about altitudes.
< I can see from your program is that I can then save the output path as a txt file>
Actually it does not save the path. It saves only the list of waypoint names, descriptions and coordinates for further processing. However you can open the kml file in a text editor. The path coordinates will be:
<LineString>
<coordinates>
Path coordinates here: lon1,lat1,alt1 lon2,lat2,alt2, ....
</coordinates>
</LineString>
Regards
Sgrillo