As suggested by Elrond, we use only one setting

mediagoblin/config_spec.ini

@@ -51,7 +51,6 @@ allow_attachments = boolean(default=False)
 csrf_cookie_name = string(default='mediagoblin_csrftoken')
 
 # Push stuff
-push_enabled = boolean(default=False)
 push_url = string(default='')
 
 [storage:publicstore]

mediagoblin/submit/views.py

@@ -126,7 +126,7 @@ def submit_start(request):
                     # re-raise the exception
                     raise
 
-                if mg_globals.app_config["push_enabled"]:
+                if mg_globals.app_config["push_url"]:
                     feed_url=request.urlgen(
                                        'mediagoblin.user_pages.atom_feed',
                                        qualified=True,user=request.user.username)

mediagoblin/user_pages/views.py

@@ -235,7 +235,7 @@ def atom_feed(request):
            'rel': 'alternate',
            'type': 'text/html'
            }];
-    if mg_globals.app_config["push_enabled"]:
+    if mg_globals.app_config["push_url"]:
         atomlinks.append({
             'rel': 'hub',
             'href': mg_globals.app_config["push_url"]})