My view is that Python packaging should not support installation of
files to anywhere other than subdirectories of the scheme [...] 
For packages that need to install to absolute locations, I would
suggest that this be handled by a post-install scriptlocations 
[...] Comments?  

I'd prefer, and think it's reasonable for a new wheel spec support absolute paths (minimally, so we don't break existing distributions)
Nick posted this a while back: https://bitbucket.org/pypa/pypi-metadata-formats/issue/13/add-a-new-subdirectory-to-allow-wheels-to