Ok, I uploaded to 1.6 and I don't see it.
The map editor uses the path.txt file just like the game does. If you want to make maps with specific mod files like systemnames and planet sizes, you have to change the path.txt file before you launch the map editor.
I was thinking you could snuggle a map editor button next to the "play seiv" button and it would accomplish this.
I am spoiled on this thing. It is very nice.
Geoschmo