for MWG 7 there is only a way to limit the throughput on a "per connection" base. This is controlled by the "Throttle" events. You can reduce the speed of a transfert betwenn Client <-> MWG and/or MWG <-> Server.
I am not aware of a way to do "real" QoS in the form of having traffic priorization based on services and/or user groups.
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