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Per user QoS, except for a few users, is often impractical on most platforms.
For inbound traffic, you can certainly police or shape traffic, but this doesn't always reduce congestion on the link.
For outbound traffic, you can very much control traffic, but before trying a complex QoS configuration, you might try FQ for all outbound flows. This more or less provides proportional bandwidth to all the flows and tends to drop packets from the high bandwidth usage flows first.
