setlinewidth and glmax2d

Yes using the following code which I'm surprised you didn't post as it would make it so much more likely that somebody will respond.

SetGraphicsDriver GLMax2DDriver()
Graphics 640,480

HideMouse 

While Not KeyHit(KEY_ESCAPE)
	Cls
	x=MouseX()
	y=MouseY()
	SetLineWidth(30)
	DrawLine 320,240,x,y
	Flip
Wend

p.s. on my system it seems to be a max line width of 10.0 for OGL driver