Moth3r said:
none, I would suggest you try asking this at the ImgBurn support forums - LUK seems to know pretty much everything about optical media formats.
Unless I'm misreading the original post, none wants to deliver a dual layer project to a factory, in which case I would never recommend using a Dual Layer disc as your master format.
Disc Image, one folder per layer is the way to go.
DVD-BOY