Good question. I don't think you can do it, because DVDs have an UDF format structure, instead of HFS+ (Mac) or NTFS/FAT (PC). Icons, folder apperance and such things are related to to invisible files on those disk formats. Even if it possible, it would have to be either a PC or Mac icon. I would like to know if it's possible at all.
Before the age of DVD, Toast allowed to create a temporary/virtual volume on your desktop so that you could control every aspect of how the CD was going to look when mounted on a computer. I don't this can be used for DVDs, because again, Toast won't offer UDF as an option for temporary partitions.
Adolfo Rozenfeld
Buenos Aires - Argentina
www.adolforozenfeld.com