It has just been brought to my attention (well, rather: I found out)
that on the German Wikipedia, if someone submits a text that constitutes
a copyright violation, the sysops there immediately delete the complete
page history and reinstate the most recent version before the copyvio.
This is a pretty serious issue; I'm pretty sure that this is not
GFDL-legal (while, obviously, keeping the copyvio in the page history
isn't either); it removes legitimate contributions from legitimate
users; and less seriously, it messes up statistics.
I am therefore strongly suggesting that someone add a feature whereby a
sysop can delete a single previous revision, rather than the entire
history of a page.
It would probably suffice to delete just from the 'old' table; if you
want to delete the most current revision, you should probably revert to
an older version first anyway, thereby moving the one you want to delete
to the 'old' table.
Timwi