Specify path to Python in settings

Hi,

On osx 10.10, I'm trying to use python3.4 with atom (macports install in /opt/local/bin/python3.4) by default, but i cant find a proper way than :
- cmd+maj+I : command = /opt/local/bin/python3.4, but i need to do that at each launch of atom
OR
- set shebang to "#!/usr/bin/env python3.4", modify "python" path to > python3.4 in zsh and edit launchctl to pass vars.
(https://github.com/rgbkrk/atom-script/issues/61#issuecomment-37337827)
OR
- set shebang to absolute path of my python3.4 install which make my script less portable.

Can you set an option to specify path to exec interpreter saved once for all ?

Have a nice day.