At http://trac.macosforge.org/projects/zfs/wiki/issues we can see :

Features in the Works

Bootable ZFS
Encrypted ZFS [ more info.. ]
Gzip support
Browsing .zfs snapshots

Grrr ...

I've understood why Mac OS Installer don't show the ZFS RAID.

Contrary to software Raid with Diskutil, creating a RAID with ZFS don't create an associated device node ...

I created one with mknod, like this "mknod b /dev/disk4 9 0" but I don't know how to attach the RAID ZFS to it ... Don't even know if it's possible ...

EDIT: In fact it seems to be possible with the following command "zfs create -V 50G "POOL"/mywol"

But this command is not implemented in MacOS and Linux ... only in Solaris.

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Mac OS X 10.6.3 • 2.8 GHz Intel Core I7 860 • ASUS P7P55D • 2 GB 2 Ghz DDR3 • ATI RADEON XFX 4890 1GB • 2 x Hitachi 160 GB Serial-ATA • PIONEER DVD-RW DVR-112 • LaCie Desktop Harddrive 750 GB USB