I have spent some time to try to install it, but no way !
What makes me crazy is the change of keyboard map not
available : I use a French one, the keys are completely
different !
I would love to try Pacman, but i'm back with Slackware on
this box. I will try again when I am a bit less p****d off.

As long as you can struggle through the install with the wrong keyboard map as far as installing the initial packages, you can then flip over to another console and enter "loadkeys /mnt/usr/share/kbd/keymaps/i386/azerty/fr.map.gz". That should set you up to use a French azerty keymap from there on. A bit later on you can permanently set the keboard map in /etc/rc.conf .

If you can't get that far, then you have, alas, fallen foul of one of the great weaknesses of the Arch install. I had a far less severe version of the same problem with my UK keyboard.

Arch is supposed to be a newbie-not-friendly distro so I think they could get away with having a Gentoo like installer, translation: none. With giving us a live CD with a console and pacman installed and a set of instructions, you wouldn't run into issues like this, it wouldn't bee too difficult at all with good instructions and a file tree tarball to download and extract. Sounds pretty easy and pretty damn good to me.