I'm with Raymond here (probably not surprisingly): -1 on backporting new features into 2.7. This really is foremost about having policies and sticking to them; special cases aren't special enough to break the rules. 

Personally, I haven't arrived yet at using -m to run the test suite (I run "python Lib\test\regrtest.py", as that works nicely with shell completion), so I don't care about the feature.