input-remapper : An easy to use tool to change the behaviour of your input devices. ( https://github.com/sezanzeb/input-remapper )
logiops : An unofficial userspace driver for HID++ Logitech devices ( https://github.com/PixlOne/logiops )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a waffle-builds
For Paludis use this rsync : rsync://gentoo.zugaina.org/waffle-builds-portage
If you have a problem : ycarus(-at-)zugaina.org