@ermal:
I think that maybe the way is as you say, but I had my doubts. I tried putting in the ACK/Queue rule the same queue for both rules, but the configuration complained with a "ACK queue must not be the same that the queue configured" error.
So, when I want that the ACKs goes to a queue that it's already shaped, simply I don't put an ACK queue specification in the rule.
@danswartz:
That is exactly what I want.
Thanks both of you, guys.