Not that I know of, QS/RM can be decoded fairly well with the older Dolby Pro-Logic 2 music mode (IIRC, not on AVRs since ~2014).
The passive speaker matrix QS/RM (partial) decoder can be used on most AVRs (set AVR to stereo mode and connect a speaker using the Hafler/DynaQuad method [documented elsewhere]).
Anyway, I think it could be another selling point for Quadios - "Hear the quad mix on your stereo [no decoder required]*".
*the quad mix will appear as stereo [see details for more listening options]
(details [maybe onscreen & in the booklet] would explain about using various decoding methods - passive, old school quad hardware, new AVRs etc.)
Kirk Bayne