Alpha: no option to create custom disk partition layout?

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http://forums.fedoraforum.org – I am installing Fedora 13 Alpha - 64 bit. While installation, X server could not be started so installing in command line - not a problem. But here, in command line installation, I don't see any option to create custom disk partition layout. It only asks me about using entire disk / free space. Also asks about which hard disks to involve in installation process. But after that, it simply goes and creates LVM with ext4 - FSM knows how many partitions. I wanted to try out btrfs, but I don't see any way to override the default partition / filesystem decisions by the inst (HowTos)