ordering by submitter, then date

[Bjorn Helgaas]

I use the order-by-submitter view, e.g.,
http://patchwork.ozlabs.org/project/linux-pci/list/?order=submitter,
to weed out superseded patches.

This would be easier if I could use two sort keys: first by submitter,
then by date.  Right now, they are ordered by submitter, but patches
from a single submitter are ordered in a way I haven't figured out
yet.

Is there a way to do this already?  If not, how hard would it be to add?

Bjorn