I was looking that with simple queues i can work with marks (made in mangle) and with priority, besides I can choose another simple queue as parent for a simple queue (like queue tree). So I cuold be thinking in implementing both, bandwith control and QoS using just simple queues (coul´d I?), in this way the mikrotik verify only the first match or follow until the last queue? In wich order?. Wich advantages has queue tree? please I need your help!!!
I was wrong, mt check the first rule and then doesn´t see the queue for each user
Use queue tree - it would me much more easier
I´m doing nat, and how can i do for apply an tree for upload and other for download, I can do it.
Prerouting chain mangle is taking place before dst-nat 
No problems there