It's possible, but because that encourages the use of easy_install/pip it would probably give more problems than that it helps. Just today there was a thread on numpy-discussion about pip failing and standard "python setup.py install" fixing the problem. easy_install is just as problematic as pip, if not more so.

People should really be encouraged to install from binaries, and otherwise follow the build instructions for their platform.

Cheers,
Ralf