Well I’m definately with Andrew here. It is very feasible to take care of all of that via a simple php/html or .htaccess redirection but this is the only industry I can think of where you constantly have to be on the lookout for sneaky referral code changes (often unannounced so as to siphon off some more free traffic).
An extra nice twist to the whole story comes when you take the initiative and implement a perfectly logical redirection and then have doubts about the “tracking”. Let me tell you the first thing the programs will tell you is “don’t mess with the links”, “you changed the links”, “you’re not supposed to…” blah. And then try explaining your code to someone who has jack all knowledge about programming etc.