[Therion] Customize the line below

Hello,! Is there a way to customize the galleries below automatically generated with Therion using MetaPost? When THconfig as the actif line "transparency on" "opacity 80 " Such as example: def l_wall_xxxxxxx (expr P) = pickup PenA; draw P withpen pencircle scaled 1.5 dotted ... enddef; I'd like the wall line below to be automatically generated as a dotted line, without having to define it with "underlying" in drawing mode [image: a.jpg] Thanks Yann