Example for app instance kwargs: https://github.com/jezdez/django/commit/46c8ca439f5d8f610080c689c6a399bf88406e12

settings.py

# ...

def custom_show_toolbar(request):
    return True # Always show toolbar, for example purposes only.

INSTALLED_APPS = (
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.sites',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    ('debug_toolbar', {
        'intercept_redirects': False,
        'show_toolbar_callback': custom_show_toolbar,
        'extra_signals': ['myproject.signals.MySignal'],
        'hide_django_sql': False,
        'tag': 'div',
    }),
)

## debug_toolbar could then use the debug_toolbar app instance itself to get app settings