cpupower-gui : This program is designed to allow you to change the frequency limits of your cpu and its governor. The application is similar in functionality to cpupower. ( https://github.com/vagnum08/cpupower-gui )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a oiledmachine
For Paludis use this rsync : rsync://gentoo.zugaina.org/oiledmachine-portage
If you have a problem : ycarus(-at-)zugaina.org