This feature request is to be able to take tracks that are PCM and be able to have them demuxed and remuxed into the mkv container directly without downconverting (which i never use). Now when i see the PCM track as the only audio track for some titles or want to keep it, i have to use another tool to demux and remux it. Also would be great to be able to handle PCM files larger than 4 gig.