traffic shaping bittorrent

[Jake Luck <openbsd@10k.org>]

What's the best way to shape multi-user bittorrent traffic with the pf? In
hope to control the aggregated upload rate, I tried to implement a
queueing system very similar to the "small home network" example as
described in the PF faq: http://www.openbsd.org/faq/pf/queueing.html :

altq on $ext_if priq bandwidth 512Kb queue 
{ qout-rest, qout-ssh, qout-dns, qout-tor, qout-tcpack }
queue qout-rest                         priq(default)
queue qout-ssh          priority 4      priq(red)
queue qout-dns          priority 5              
queue qout-tcpack       priority 6      
queue qout-tor          priority 0      priq(red)

altq on $int_if cbq bandwidth 3Mb queue 
{ qin-rest, qin-ssh, qin-dns, qin-tor, qin-boss }
queue qin-rest          cbq(default)
queue qin-ssh           priority 4
queue qin-dns           priority 5
queue qin-tor           bandwidth 100Kb cbq
queue qin-boss          bandwidth 200Kb cbq(borrow)

....
pass out on $ext_if inet proto tcp from any to any port 6881:6889
keep state queue qout-tor
pass out on $int_if inet proto tcp from any to any port 6881:6889 
keep state queue qin-tor

What am I missing? j
(Running x86 -current on a IPed filtering bridge)