diff --git a/tailbone/forms2/core.py b/tailbone/forms2/core.py
index 0702b73e..7c2a8918 100644
--- a/tailbone/forms2/core.py
+++ b/tailbone/forms2/core.py
@@ -259,7 +259,7 @@ class Form(object):
                  model_instance=None, model_class=None, nodes={}, enums={}, labels={}, renderers={},
                  widgets={}, defaults={}, validators={}, required={}, action_url=None, cancel_url=None):
 
-        self.fields = list(fields) if fields is not None else None
+        self.fields = FieldList(fields) if fields is not None else None
         self.schema = schema
         self.request = request
         self.readonly = readonly
@@ -291,9 +291,9 @@ class Form(object):
         mapper = orm.class_mapper(self.model_class)
 
         # first add primary column fields
-        fields = [prop.key for prop in mapper.iterate_properties
-                  if not prop.key.startswith('_')
-                  and prop.key != 'versions']
+        fields = FieldList([prop.key for prop in mapper.iterate_properties
+                            if not prop.key.startswith('_')
+                            and prop.key != 'versions'])
 
         # then add association proxy fields
         for key, desc in sa.inspect(self.model_class).all_orm_descriptors.items():
@@ -574,3 +574,17 @@ class Form(object):
     def validate(self, *args, **kwargs):
         form = self.make_deform_form()
         return form.validate(*args, **kwargs)
+
+
+class FieldList(list):
+    """
+    Convenience wrapper for a form's field list.
+    """
+
+    def insert_before(self, field, newfield):
+        i = self.index(field)
+        self.insert(i, newfield)
+
+    def insert_after(self, field, newfield):
+        i = self.index(field)
+        self.insert(i + 1, newfield)