You can specify line thinness for elements in the schematic editor. The plot dialog also says that the Default line Option only applies to default lines of thickness of 0. This seems to work wrong…
Instead of overriding lines of thickness 0, it makes all lines smaller than the default line width default line width. This makes it impossible to define lines thinner than the default which reduces the possible output vocabulary dramatically.
Is this intentional and is the GUI tool tip wrong or is the exporter wrong?
Also while we are here would probably be nice if the output messages window path texts could be links to the file generated.