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Thanks for landing this barry, there's a couple quirks with your improvements - loadTestsFromModule(mod, foo, bar) will raise a TypeError but not warn about foo the way loadTestsFromModule(mod, foo) will.
Secondly, the TypeError has an off-by-one error in its output:
loadTestsFromModule(mod, foo, bar) will claim 2 arguments were passed. Three were.
diff -r d0ff527c53da Lib/unittest/loader.py
--- a/Lib/unittest/loader.py	Mon Sep 08 14:21:37 2014 -0400
+++ b/Lib/unittest/loader.py	Tue Sep 09 07:32:05 2014 +1200
@@ -79,12 +79,12 @@
 # use_load_tests argument. For backward compatibility, we still
 # accept the argument (which can also be the first position) but we
 # ignore it and issue a deprecation warning if it's present.
- if len(args) == 1 or 'use_load_tests' in kws:
+ if len(args) or 'use_load_tests' in kws:
 warnings.warn('use_load_tests is deprecated and ignored',
 DeprecationWarning)
 kws.pop('use_load_tests', None)
 if len(args) > 1:
- raise TypeError('loadTestsFromModule() takes 1 positional argument but {} were given'.format(len(args)))
+ raise TypeError('loadTestsFromModule() takes 1 positional argument but {} were given'.format(len(args) + 1))
 if len(kws) != 0:
 # Since the keyword arguments are unsorted (see PEP 468), just
 # pick the alphabetically sorted first argument to complain about,
diff -r d0ff527c53da Lib/unittest/test/test_loader.py
--- a/Lib/unittest/test/test_loader.py	Mon Sep 08 14:21:37 2014 -0400
+++ b/Lib/unittest/test/test_loader.py	Tue Sep 09 07:32:05 2014 +1200
@@ -272,7 +272,7 @@
 # however use_load_tests (which sorts first) is ignored.
 self.assertEqual(
 str(cm.exception),
- 'loadTestsFromModule() takes 1 positional argument but 2 were given')
+ 'loadTestsFromModule() takes 1 positional argument but 3 were given')
 
 @warningregistry
 def test_loadTestsFromModule__use_load_tests_other_bad_keyword(self):