I forgot to mention... when calculating the video bitrate, I used 384kbps for each audio track, but at the end I changed my mind and used 448kbps... so, the resulting file it too big for a dual layer DVD!
I think the next release will use the same video bitrate, and the soundtracks lower bitrates (from 448 to 384kbps) to stay inside DL DVD size limit. OR I'll include DD 2.0 Dolby Surround encoded. Or should I lower the video bitrate?