Hi,
dnf-plugins-core just made it into Fedora 20. So you may try it without hacking. See:
http://dnf-plugins-core.readthedocs.org/en/latest/copr.html
Enjoy
--
Miroslav Suchy, RHCE, RHCDS
Red Hat, Senior Software Engineer, #brno, #devexp, #fedora-buildsys