[Answer]-How to add (not override) migrations to a third party app in Django (South)

When writing a datamigration, you can specify which apps “participate” in the datamigration with the --freeze command line flag. If you have a glue or core app, as I like to call them, just add your datamigration there, and specify --freeze waffle on the command line. You can then access the waffle models via orm['waffle.ModelNameHere'].

This way, you don’t need to override anything. You might need to set depends_on to get the migration order right.