@NiluJe: oh ... my bad. I assumed Doitsu's ini setting influenced kindlegen's behavior. I didn't realize dualmetafix was part of the plugin.
@Doitsu: any interest in having your plugin grab the asin from the comment in KU's output? Or if it would make things easier for everyone, I wouldn't mind modifying my KindleImport plugin to create the ASIN dc metadata entry that your plugin looks for. It'd be a pretty-quick opf diddle on my end.