To the first question, you can use ASIO plus a multitrack recording software, like Vegas or Soundforge 9 (pay software but you can use them in full for a trial period).
As the second question, the only mode besides using the method in the first answer, is to use DTS:Neo 6 decoding from Cyberlink PowerDVD 7 Audio Effect filter in graphedit.
Like this:


First, render the media file (but DON'T PLAY IT), then load the Cyberlink Audio Effect, then WavDest and File writer.
DON'T PLAY the rendered media file before connecting to File writer, or the file will probably will be played in 2ch mode, which will make File writer to write a 8ch audio file but with the header of a 2ch file, making the file useless. Also, DON'T PLAY IT (not even for testing) before setting the Audio Effect filter to 8ch or, again, the File writer will write a 2ch file.
This is the file loaded in Vegas after doing it the graphedit way:
Later, dude