This is one area where I have given up interest, partly because my work has of late scaled down to basic stereo. But yes, it would have been nice a few years ago to be able to ingest an RME DURec recording and create the appropriate mono and stereo tracks in the one process. Outboard software as supplied by RME, Sound Devices, QSC was needed to make their use of multichannel .wav viable. Should this happen, out of curiousity I would dig out a few of my old DURec files and see how well it works.
As I see it, WL (as with SF) has hitherto regarded its mission as being a multichannel editor, not a multi-track production tool. The necessary structural change to implement the latter would indeed, in my opinion, be worthy of a ‘10’ … if it survives in a recognisable form!