diff --git a/IPython/core/prefilter.py b/IPython/core/prefilter.py
index 16032d0..7f01add 100644
--- a/IPython/core/prefilter.py
+++ b/IPython/core/prefilter.py
@@ -129,7 +129,7 @@ class PrefilterManager(Configurable):
     or :meth:`sort_transformers` method after changing the priority.
     """
 
-    multi_line_specials = CBool(True, config=True)
+    multi_line_specials = CBool(True).tag(config=True)
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC', allow_none=True)
 
     def __init__(self, shell=None, **kwargs):
@@ -359,12 +359,12 @@ class PrefilterManager(Configurable):
 class PrefilterTransformer(Configurable):
     """Transform a line of user input."""
 
-    priority = Integer(100, config=True)
+    priority = Integer(100).tag(config=True)
     # Transformers don't currently use shell or prefilter_manager, but as we
     # move away from checkers and handlers, they will need them.
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC', allow_none=True)
     prefilter_manager = Instance('IPython.core.prefilter.PrefilterManager', allow_none=True)
-    enabled = Bool(True, config=True)
+    enabled = Bool(True).tag(config=True)
 
     def __init__(self, shell=None, prefilter_manager=None, **kwargs):
         super(PrefilterTransformer, self).__init__(
@@ -389,10 +389,10 @@ class PrefilterTransformer(Configurable):
 class PrefilterChecker(Configurable):
     """Inspect an input line and return a handler for that line."""
 
-    priority = Integer(100, config=True)
+    priority = Integer(100).tag(config=True)
     shell = Instance('IPython.core.interactiveshell.InteractiveShellABC', allow_none=True)
     prefilter_manager = Instance('IPython.core.prefilter.PrefilterManager', allow_none=True)
-    enabled = Bool(True, config=True)
+    enabled = Bool(True).tag(config=True)
 
     def __init__(self, shell=None, prefilter_manager=None, **kwargs):
         super(PrefilterChecker, self).__init__(
@@ -411,8 +411,8 @@ class PrefilterChecker(Configurable):
 
 class EmacsChecker(PrefilterChecker):
 
-    priority = Integer(100, config=True)
-    enabled = Bool(False, config=True)
+    priority = Integer(100).tag(config=True)
+    enabled = Bool(False).tag(config=True)
 
     def check(self, line_info):
         "Emacs ipython-mode tags certain input lines."
@@ -424,7 +424,7 @@ class EmacsChecker(PrefilterChecker):
 
 class MacroChecker(PrefilterChecker):
 
-    priority = Integer(250, config=True)
+    priority = Integer(250).tag(config=True)
 
     def check(self, line_info):
         obj = self.shell.user_ns.get(line_info.ifun)
@@ -436,7 +436,7 @@ class MacroChecker(PrefilterChecker):
 
 class IPyAutocallChecker(PrefilterChecker):
 
-    priority = Integer(300, config=True)
+    priority = Integer(300).tag(config=True)
 
     def check(self, line_info):
         "Instances of IPyAutocall in user_ns get autocalled immediately"
@@ -450,7 +450,7 @@ class IPyAutocallChecker(PrefilterChecker):
 
 class AssignmentChecker(PrefilterChecker):
 
-    priority = Integer(600, config=True)
+    priority = Integer(600).tag(config=True)
 
     def check(self, line_info):
         """Check to see if user is assigning to a var for the first time, in
@@ -468,7 +468,7 @@ class AssignmentChecker(PrefilterChecker):
 
 class AutoMagicChecker(PrefilterChecker):
 
-    priority = Integer(700, config=True)
+    priority = Integer(700).tag(config=True)
 
     def check(self, line_info):
         """If the ifun is magic, and automagic is on, run it.  Note: normal,
@@ -492,7 +492,7 @@ class AutoMagicChecker(PrefilterChecker):
 
 class PythonOpsChecker(PrefilterChecker):
 
-    priority = Integer(900, config=True)
+    priority = Integer(900).tag(config=True)
 
     def check(self, line_info):
         """If the 'rest' of the line begins with a function call or pretty much
@@ -507,11 +507,11 @@ class PythonOpsChecker(PrefilterChecker):
 
 class AutocallChecker(PrefilterChecker):
 
-    priority = Integer(1000, config=True)
+    priority = Integer(1000).tag(config=True)
 
-    function_name_regexp = CRegExp(re_fun_name, config=True,
+    function_name_regexp = CRegExp(re_fun_name).tag(config=True,
         help="RegExp to identify potential function names.")
-    exclude_regexp = CRegExp(re_exclude_auto, config=True,
+    exclude_regexp = CRegExp(re_exclude_auto).tag(config=True,
         help="RegExp to exclude strings with this start from autocalling.")
 
     def check(self, line_info):
@@ -611,11 +611,9 @@ class AutoHandler(PrefilterHandler):
         line    = line_info.line
         ifun    = line_info.ifun
         the_rest = line_info.the_rest
-        pre     = line_info.pre
         esc     = line_info.esc
         continue_prompt = line_info.continue_prompt
         obj = line_info.ofind(self.shell)['obj']
-        #print 'pre <%s> ifun <%s> rest <%s>' % (pre,ifun,the_rest)  # dbg
 
         # This should only be active for single-line input!
         if continue_prompt: