I would like to see mind blast and devouring plague for level 20 spriests, deterrence for hunters, cloak of shadows and sprint for rogues, pummel and hamstring for warriors, and STORMSTRIKE FOR ENH SHAMANS!
If you are a tauren, you can use the hawkeye rifle from the mulgore quest chain, I think for killing the black kodo. Beyond that, I'm not sure if there are any other black ranged weapons.
Meh, in the end, GY farming will happen. If it starts happening to me, I just slip away and avoid the other team. As long as they aren't getting kills, they are wasting their own time.