Add convenient method to create new session records

program/lib/Roundcube/rcube_session.php

@@ -179,6 +179,24 @@ public function write_close()
         $this->gc_shutdown();
     }
 
+    /**
+     * Creates a new (separate) session
+     *
+     * @param array Session data
+     *
+     * @return string Session identifier (on success)
+     */
+    public function create($data)
+    {
+        $length = strlen(session_id());
+        $key    = rcube_utils::random_bytes($length);
+
+        // create new session
+        if ($this->write($key, $this->serialize($data))) {
+            return $key;
+        }
+    }
+
     /**
      * Merge vars with old vars and apply unsets
      */