What I tried to express in the last paragraph of the referenced mail was
that it's not pf that's lacking anything, but altq. There simply are no
input queues with altq. If you added those queues to altq, you might not
even have to change a single line in pf to get them used.

While there are now ties between pf and altq (pf classifying packets for
altq, and pfctl setting up queues), that doesn't mean the core of altq
is maintained by the people who maintain pf. It's in separate source
files, and if you compare the respective CVS histories, you'll see the
difference.

Question's of the form "why hasn't this been done" sound kind of weird
to me, almost as if they were rhetorical. Assuming you haven't donated
blood in the last month, "why haven't you"? Are you really interested in
the petty excuses humans have for not doing things? :)

Daniel