[dev]

from what i've attempted in the past, you can route traffic based on its IP to a different gateway (ie the DSL connection). Now if you play on the same servers all the time, that'll work "fine". If you play on different servers and so routing by IP or an IP range isn't possible, you could possibly route all the UDP traffic over the DSL connection but put in a rule that ignores DNS traffic. AFAIK you can't do this on windows by default and would need the router to do it, or more easily, a linux box that connects to both connections