When I did use Gentoo as the primary Linux distribution on my computers I did maintain a couple of ebuilds. I did maintain these ebuilds because lack of updated version in the official Gentoo tree or package not in the official tree at all.
If you are interested in any of these ebuilds you can find them at chown.dk.
Please note that I no longer use Gentoo, so these ebuilds are no longer maintained. I stopped using Gentoo back in 2008, so the ebuilds might not even work any longer.