A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
This is what we ended up doing for our project just now, this is in our PostBuildProcessor that already is modifying the plist file.
I have a Jenkins build job for asset bundles and one of the things slowing it down is logging produced by Unity which IMHO is useless, for example...