I really like Pmw. Have you considered putting Pmw on PYPI so that it works with easy install?
Since you have a setup.py, all you need to do is the following:
python setup.py register
python setup.py sdist upload
and then the rest of us can automatically download Pmw from PYPI via "easy_install Pmw" and reference it as a dependency in our own python projects.
I'd be happy to help with the this if the above doesn't work.