How to prevent setuptools install package as an .egg

How to prevent setuptools install package as an .egg

For example, installing IPython on Linux (where setuptools is not
installed) I've got IPython installed in site-packages\IPython.
Installing IPython on Windows (where IPython requires setuptools), after
executing the same command
python setup.py install
I get IPython installed in site-packages\ipython-0.13.2-py2.7.egg\IPython
Is there a way to install the module "old way" i.e. into
site-packages\IPython?



PS: I've discovered that
python setup.py install --old-and-unmanageable
does the job, but I am not sure it is a good way as --old-and-unmanageable
is marked "Try not to use this!".