for the Make2D command run from a Rhino script you could see all available options in the command prompt if you suppress the dialog using a hyphen in front of the command. eg.: -Make2D will show these:
DrawingLayout=CurrentView
ShowTangentEdges=Yes
CreateHiddenLines=No
ShowViewRectangle=Yes
MaintainSourceLayers=Yes
Layernames can be defined if you set the MaintainSourceLayers option to No.
c.