You can. It's called Darkfall, it has full loot PvP and no auto-targeting. Sadly, it also has a monstrous grind and it only applies to the "niche" of people who will be willing to do that. People who used to like Shadowbane for instance.
I sincerely find the discovery of this thread telling me that world PvP has no incentive a complete disappointment to be honest. For me, the allure of world PvP having its own incentive to the "instanced arena PvP" was the only reason I bought this game back in early December.
While I'm currently enjoying the PvE content of the game and the atmosphere, months (maybe weeks?) down the line when I hit the level cap I fully expect to be engaging in some meaningful world PvP,even if it's just for "valor".
Because so far, I hate the **** out of that terribly designed map called "Huttball" and I found Voidstar to be passable but a complete cluster**** of an arena. (haven't played Civil War yet) I don't want to just have to play instanced PvP; I want to see world PvP be a viable form of entertainment.
Oh,and give us the option to queue for specific warzones already please?