This sounds like the kind of thing that would generally get added as part of a plugin. For example, the camera plugin adds the CONTACTS_USAGE_DESCRIPTION:
In addition, if for whatever reason you need to tweak your Info.plist file further, you can use the config-file element.
There is so much contradictory and incomplete information about the config.xml file in the public domain.
May I reccommend that you publish and maintain a 'master' config.xml file which specifies all mandatory settings for ALL of your standard plug-ins e.g. camera, contacts, geolocation etc.. which target ALL major operating systems i.e. Android + iOS?
Developers could simply copy this file and edit/remove those plug-ins which are not necessary, safe in the knowledge that their apps will not be rejected on the ground of missing configuration settings, as is the case with mine.
I beleive that this would strengthen the appeal and usability of PhoneGap.
Kind Regards, Garry.
My config.xml file is now huge and it really has been a case of trial and error, but thanks to Ryan for his help.
I now have iOS and Android submitted to stores and am hopefully in the final stages of Windows Store submission, after which I will share my config.xml to hopefully help a future variant of me.