Patch will be checked into GIT. I read all of the email again and it seems to at least be limited to 32 in most cases, but I find that if you use Settings->Format, you can create more than 32 channels anyway as I set it to 36 and it did not complain.
into CinGG, it shows 16 audio tracks!, but ffprobe, mediainfo, and Resources window info/details shows 8!
I am not sure that consensus was, but I see even dvd can contain up to 7.1 audio, and even this mpeg multichannel encoder I just rediscovered had some support/experiments in this direction, in 1990s)