i would like to add AudioMuxer as an idea to replace eac3to - AudioMuxer also uses eac3to but with a very userfriednly GUI.
that might help to split into seprate mono files.
Tools > Audio Conversion.

I don't have DTS HDMA Suite, i hope i get one day.
Right now i am looking for some way to dub jp. DVDs with external AC3 Audio, is there a way to dub without quality lose?
would also be great for DTS core tracks.