The new mdadm tools default to version 1.x, and we found our newly deployed servers unable to boot, so we got bit by this issue the hard way and had to go back and recreate them with superblock version 0.90
Posted Mar 9, 2011 17:52 UTC (Wed) by nix (subscriber, #2304)
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As far as I know, there are no plans ever to implement this, though Neil is not averse to someone else doing the work. But you don't need it: it took me three hours to come up with an initramfs that could boot my RAID arrays, and after that I didn't care what the kernel's built-in /-mounting code did. (Virtually every distro already has initramfses / initrds that do this.)