You can pass in the config object as the children argument to a Group

Author: photonstorm

v3/src/gameobjects/group/GroupFactory.js

@@ -2,6 +2,12 @@ var Group = require('./Group');
 
 var GroupFactory = function (scene, children, config)
 {
+    if (typeof children === 'object' && config === undefined)
+    {
+        config = children;
+        children = [];
+    }
+
     return new Group(scene, children, config);
 };