^ The problem is that you can't set it to a high enough bitrate because it is locked to a 13Mbps maximum. If it could be unlocked somehow, great.
You mention a splitter that I already listed as one of two options in my original post...
To answer your question of what I capture: kids' shows; most of them seem to be produced in 5.1 but aren't aired or streamed as such.
Plus I prefer Dolby Surround tracks on older movies to a 5.1 upmix.