Message 226842 - Python tracker

Actually, I think the method Martin used was to create a local config.py in Tools/msi/, which provided the proper settings for the release.  See http://hg.python.org/cpython/file/2.7/Tools/msi/msi.py#l37

Either way, the buildbots are completely unaffected by Tools/msi, and I don't think anything actually uses PCbuild/build_tkinter.py (unless you do :)), so since the script is now yours, I'd say you're clear to change as you like.