If I remember right, the code needed for this has implications for a lot of 
things:

- defrag
- adding disks to raidz zvols
- removing disks from vols
- restriping volumes (to give consistent performance after expansion)

In fact, I just found the question I asked a year or so back, which had a good 
reply from Jeff
http://opensolaris.org/jive/message.jspa?messageID=186561

... and while typing this, I also just found this blog post from Adam Leventhal 
in April, which is also related:
http://blogs.sun.com/ahl/entry/expand_o_matic_raid_z
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