I would love it if every product in this category to be able to stream from the same source and be selectable as stereo (if two speakers), mono-center, mono-lef

I would love it if every product in this category to be able to stream from the same source and be selectable as stereo (if two speakers), mono-center, mono-left-only and mono-right only -- this way I can by more than one and place them as I like. I'm not sure Bluetooth is up to it, which means that one would need to act as master and broadcast to slaves. (And the master would probably have to delay a bit to phase-match w/the remote.)