Hi,
Unfortunately our core team do not have the resources here to help people use the open source code version to build custom apps. We provide a service where we can customise the app for anyone who needs it including the Push notifications (Airnotifier) service management. This service helps fund the improvement of the app in general: https://moodle.com/mobileapp/
When using the phonegapbuild repository you need to modify the file www/build/mm.bundle.js.Kind regards,
Dani