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PVP will either make tankers useless or one of the most important things to have. It all comes down to if Taunt forces a PC to not be able to target anyone but the tanker or not.
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I definately hope it doesn't cause come down to a choice like that. Personally I would like to see a taunt cause an accuracy debuff to the effected targets against all other targets except the taunter (coding I am sure would be impossible but hey I can dream).
As for seperate PvP & PvE rules just create another set of enemy definitions. Minion, Lt, Boss, AV, Object, & Player and adjust skills as necessary for the Player set only.