If a mono mix and dolby surround mix, totalling 288kbps together, wouldn't fit on the disc then a PCM track at 1536kbps is hardly going to fit! Still, your speeded-up PCM track would make a good source for an AC3 encode, if you can live with the pitch shift.

But the release as it stands can easily be fixed by turning the volume up when watching, so I'm not going to worry about it too much.

I won't do a V2 until I've acheived a significant improvement in overall video and audio quality, and even then if there is an X0 version available then a Moth3r V2 would probably be superfluous.