composer/composer — pull request #2719 by jurahu (2014-02-18 08:38:12+00:00)
Title: New option --json-file=myfile.json for overriding the default composer.j...

We are using it for building the project with different modules,
we do not want to use branches or another repo just for slightly different configuration.

If there is anything that needs to be changed or improved to get this accepted please tell me.
(Crossing fingers hoping for best)