I got tired of letting config.gem kick my behind, so I created a little github project to unite all config.gem in one place, with its options like :lib, :version, making it easy to find.
So, if you want to colaborate just clone the repo and add the config.gem to the gems you use.
http://github.com/lucasuyezu/config.gem–unite-/tree/master
The project is public, I hope google index it soon so people can find the config.gem for their gems in the web quickly.