Comment 3 for bug 1403384

Yes, you can build your own packages for ubuntu/centos and add this packages into the plugin, the only thing which you should do before the deployment is to enable the plugin on Fuel UI Settings tab, and the repository will be added on the target nodes automatically.
Take a look at the examples [1], [2] and also take a loot at our documentation [3].

[1] https://github.com/Mirantis/fuel-plugins/
[2] https://github.com/stackforge/fuel-plugins
[3] https://review.openstack.org/#/c/138013/19/pages/plugin-dev/020-fuel-plugin-dev.rst - the document is in progress, but ready to use