Feature Request : Allowing users to specify develop-options

[asmodehn]

Referring to #562

Currently --install-option is passed to both setup.py install and setup.py develop calls.
But their interface (options available from setuptools) are different.

This would make more sense to me :

• pip has an option to pass --install-option when setup.py install is called, but not setup.py develop.
• pip also has an option to pass --develop-option that does the same as --install-option but for the cases where setup.py develop is called.

This way the user can pass different options in the same pip call.

[dstufft]

Closing this, while it is true we don't have support for it, in the future we're going to add customizable build systems and that work will invalidate this work and supersede it.