If I good remember, that was not a reasonable way! :)

Something like that

Draw a line past it in the clip board Draw it on the 2D program
Change the "moi.view.lineWidth"

Draw a line past it in the clip board Draw it on the 2D program
Change the "moi.view.lineWidth"
etc...

You must better wait that Michael makes a more fluent function! ;)

PS Also maybe change lines in the Moi.ini