setting DVD region code

I found this old thread... [url]https://www.afp548.com/forum/viewtopic.php?forum=29&showtopic=9668&highlight=region%20code[/url] Anyone have any further ideas on how best to preset the DVD Region Code for use with InstaDMG? I haven't even investigated it yet. I will, I will. Just wondering if anyone has already looked into it.