Add device "modes"
There could be 3 or 4 different device "modes" you could switch through in settings.
Battery: This mode would help save the battery of your Quest by turning the brightness down all the way, turning the refresh rate down to 72hz, turning off the mic and voice assistant, and if possible you could use the new Application Space Warp to run the Quest at only 36 fps.
Performance: This mode would prioritize performance by doing stuff like using Application SpaceWarp to run games at 120 fps. There is probably some other behind-the-scenes stuff that could be added to make the performance even better like turning down resolution or fov.
Quality: This mode would prioritize quality to turn brightness almost to max and turn the refresh rate to 72hz or maybe 90hz, I don't know if it is possible to raise the resolution but maybe that could be done.
Balanced: This mode would probably be the default mode and would set almost everything to a very neutral setting. Brightness would be in the middle, refresh rate would be 90hz or 72hz.
Obviously you wouldn't want any of this stuff locked in place if you select a mode. You should be able to change stuff like prightness and if you want the voice assistant on in any of these modes.