we have wallpaper and ringtones customization by settings.json, please see [MozillaWiki:MarketCustomization](https://wiki.mozilla.org/B2G/MarketCustomizations). Actually we replace default settings by json file just like [firefox mobile distribution mechanism](https://wiki.mozilla.org/Mobile/Distribution_Files). so I think camera.recording.preferredSizes without 'device-customization' is better and align to firefox mobile.