ipfw dynamic pipes

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hello gentlemen,

does anybody know how to make dynamic pipes for 2 directions - in/out ?

usually i do:
ipfw pipe 1 config bw 1Mbit/s mask src-ip 0xffffffff
ipfw pipe 2 config bw 1Mbit/s mask dst-ip 0xffffffff
then
ipfw add 10 pipe 1 all from $mynet to any via $if out
ipfw add 11 pipe 2 all from any to $mynet via $if in

in this case each ip get two 1Mbit/s pipes - one in and one out

But now i need to create one pipe for in and out. E.g each ip should use 
same pipe for in/out.
But i`m stuck how to do this dynamic way.

---
Denis