Index: query.py
===================================================================
--- query.py	(revision 3996)
+++ query.py	(working copy)
@@ -721,6 +721,9 @@
         format = kwargs.pop('format', 'list').strip().lower()
         query_string = '&'.join(['%s=%s' % item for item in kwargs.iteritems()])
 
+        #replace dynamic variable $USER
+        query_string = query_string.replace('$USER', req.authname)
+            
         query = Query.from_string(self.env, query_string)
         tickets = query.execute(req)