A 9.2 receiver will only give you a total of 3 zones.
A 5.1 zone(#1) and 2 stereo zones.
You could make the 5.1 a stereo zone but you'd be wasting the 2 sub-woofers.
Normally you would use the 5.1 for home theatre, 1 stereo zone for the kitchen (hardwired speakers for instance) and another stereo zone.
With pulseaudio you can split that. I have split it on my 7.1 amp into 3 stereo zones and 1 mono in my study and the 7.1 amp in the living indeed in a 5.1 and a stereo zone.
Being cheap myself ($$$), I would have my home theatre zone and 1 two channel stereo zone. (7.1)
I would take the stereo output to a audio distributor (mechnical) which would then be hard wired out to audio volume controls to the stereo speakers in the room or location.
The distributor could have X number of outputs on it (you could even use one of those wireless Rocketfish transmitter receivers off the distributor).
You could even get one of those newer app controlled audio distributors ($$$), but really, send the output from radio, cd player, MP3 device, etc to the cheaper mechanical device where you can manually turn on the audio areas. Or leave them always on and control them via the audio volume controls.
LMCE still controls the receiver but you have to manually intervene on the distributor/volume control side.
Quite interesting. which audio distributer you advise (no wireless stuff).
I hope that my 2 cents helps (see I am cheap - should be at least 5 cents with inflation).