The only reason many of us use optical media is to "Archive" information to a format that will not go bad is 10 years (MDisc).
The size of an optical disc is now so much smaller than a hard drive that you have to span discs in order to really create an effective backup or archive.
I'd love to keep using Imgburn. It has always been my favorite. It has fallen behind in this one area. It doesn't interactively span discs when writing files and folders that have sizes larger than the media.
This doesn't look hard from a flow chart perspective. I guess it is work though...Best, MW