Sorry for the extended delay in response here.  As soon as you asked for
that information, I tried to reproduce it again on 10.04 a2 upgrade
through to current daily but couldn't anymore.  Due to other extenuating
circumstances I wasn't able to run a full dist-upgrade from a 9.10
install with (hd0,3) preseeded until now.

I've made the change to install to install to the device node for the
10.04 based installs, so there shouldn't be any worries for those
machines going forward.

Regarding why we're installing to the partition in the first place, it's
because the MBR that's on the drive isn't a true DOS MBR, but something
unique and specific to the factory processes.  By the time it gets to
the customer site and they break the electronic seal (press a key at the
EULA on boot) it will begin behaving like a standard DOS MBR, referring
to the active partition.  Installing grub to the MBR would prevent this
behavior.

So regarding my results from a 9.10 -> 10.04 upgrade, I just tried today
from a fresh 9.10 install from an image preseeded with (hd0,3).  Rather
than it making a poor choice and behaving improperly, I was instead
offered a dialog to choose where to install grub to.  It appears to let
me select where to install grub to.  I'm sure this dialog will be rather
shocking to anyone who received a system like this though, as they may
have no idea that they were booting off the third partition.  I'll
attach a screenshot of this behavior to show.

** Attachment added: "Screenshot.png"
   http://launchpadlibrarian.net/40562977/Screenshot.png

-- 
postinst has errors with grub-probe that cause the system to stop booting
https://bugs.launchpad.net/bugs/508173
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