Grub2 - setting to sda

[Goh Lip]

Greetings, I think grub2 has been a far better improvement over 
grub-legacy and thanks for making this happen.

There is one nifty  feature in grub-legacy and that is setting grub to 
sda and is done at the  >grub prompt. Namely, root (hd0,x); setup (hd0).

In grub2 this is done at the OS terminal by
sudo grub-install --root-directory=/media/partitionname /dev/sda

Is there a method where this can be done at the sh:grub> prompt without 
needing to boot into the OS?

Thanks again.

Regards,
Goh Lip