@Leoandru:
been doing some reading on altq and came upon this:
http://www.benzedrine.cx/ackpri.html
Finally, the rules passing the relevant connections (statefully) are extended to specify what queues to assign the matching packets to. The first queue specified in the parentheses is used for all packets by default, while the second (and optional) queue is used for packets with ToS (type of service) 'lowdelay' (for instance interactive ssh sessions) and TCP ACKs without payload.
not sure if it has the same binings to the gui in pfSense. but my guess is that its related.
We invisibly create the ACK queue. ALTQ only shapes outbound on an interface, we create rules for BOTH interfaces and that's what the queues relate to. An inbound (on the internal interface) and an outbound (on the external interface).
–Bill