Probably the biggest thing you can do is use a wired connection. It will always outperform WiFi latency wise. Then there is your Internet connection itself. A true fibre-based connection will outperform any kind of DSL or coax. Anything you put into the priority queue will always be sent first. You won't be able to create rules for "all gaming" as they all use different hosts and ports. You could try targeting some specific games by finding out the IP addresses and ports they connect to. Or you could try marking traffic from your specific machines and put them into the priority queue and dedicate those machines to gaming (this is probably easier).
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