in a reply from the M-Audio tech support email:
Jason,
Thank you very much for your feedback! We are working towards a solution to both issues you mentioned (S/PDIF at higher sample rates / eliminate 2 GB file size limit) and you should see an improvement in a future firmware update.
Thank you again for your feedback and best regards,
Roland
M-Audio Tech Support
FYI, the only "issues" I asked them about was S/PDIF recording at 24/96 and a work-around for the 2 gig file size limit. I asked them nothing about analog inputs or battery life.
while it's the same thing they've said all along, (i.e. "it's coming in a future update"), it is somewhat reassuring to know that they are aware of the issues.
hopefully we'll see these sooner rather than later.