I've tried to assign the "folder key" of my logitech internet keyboard using keycodes gained by xev and adding them in ~/.Xmodmap to have it working. The keycode is 133 but my XModmap is not used! That is, it is parsed (I added a debug line in /etc/X11/xinit/xinitrc to ensure this) but the key is not mapped (verified with xev): I need to open a konsole and write "xmodmap .Xmodmap' to have it working (again, verified with xev). Using kde 3.1.2 and xfree 4.3.0-r2 here.
I have verfied this bug. I have mapped my "printer" button (keycode 117) to backspace and it does not work in Konsole until I run xmodmap .Xmodmap However, it does work in other KDE applications such as Konqueror. I have responded to a similar bug in the konsole-devel mailing list. Hopefully I will get a complete answer as to why konsole does this. (I imagine it might have to do with preventing conflicts over which has priority...keymaps or xmodmap??) If you want to map keys into Konsole without running xmodmap you will need to look at the *.keytab files in /usr/kde/3.1/share/apps/konsole/
<shrug> - this doesn't seem like a Gentoo issue but a local config issue? Closing as a wontfix, unless someone proposes a fix for it.