Index: sites/all/modules/simplefeed/simplefeed_item.module
===================================================================
--- sites/all/modules/simplefeed/simplefeed_item.module	(revision 903)
+++ sites/all/modules/simplefeed/simplefeed_item.module	(working copy)
@@ -445,6 +445,17 @@
       $values['taxonomy'] = $item->taxonomy;
 
       $count++;
+
+      // hook_simplefeed_item_fields(), allow other modules to override fields
+      // or insert new ones.  The return must be an array of fields suitable
+      // for applying to feed_item_node_form.
+      foreach (module_implements('simplefeed_item_fields') as $module) {
+        $result = call_user_func($module .'_simplefeed_item_fields', $values, $item);
+        if (is_array($result) && count($result) > 0) {
+          $values = array_merge($values, $result);
+        }
+      }
+
       // create a new feed-item node, adding in all of the other node defaults
       drupal_execute('feed_item_node_form', $values, $node);
     }