You no longer have to @expose() generic controller handlers. You can

simply pass through any keyword arguments you like, just as you would to
@expose(). See tests for examples.

pecan/decorators.py

@@ -6,8 +6,9 @@ def _cfg(f):
 
 
 def when_for(controller):
-    def when(method):
+    def when(method=None, **kw):
         def decorate(f):
+            expose(**kw)(f)
             _cfg(f)['generic_handler'] = True
             controller.pecan['generic_handlers'][method.upper()] = f
             return f

tests/test_generic.py

@@ -11,13 +11,11 @@ class TestGeneric(object):
             def index(self):
                 pass
             
-            @index.when(method='POST')
-            @expose('json')
+            @index.when(method='POST', template='json')
             def do_post(self):
                 return dict(result='POST')
             
             @index.when(method='GET')
-            @expose()
             def do_get(self):
                 return 'GET'