Try again with keytouch
It's a bit tricky to make it work, it took me some time too, but i don't know if there's another program to do that.
The other solution is to mess with xmodmap and/or xkb.
I should do that to fix the keys that adjust the monitor brightness but i still haven't completely figured out how to do it
So far, i'm using kpowersave's GUI to do that...
Anyway, i'll let you google that...
If you find something useful, let us know, it might be useful to others too