Very simple open world PvP:
- Make it toggle-able
- Keep it default off for all new players
- Type /pvp to "toggle" yourself as "on". Put a cooldown on this (5-10mins)
-- A subset of this is that you'll need some sort of indicator that you're open for PKing, so maybe something like a sword icon next to the linkshell shield icon or perhaps changing of someone's name color. The point of this is that YOU and others should be able to easily identify if you're in PvP mode.
Yes, I realize this is a WoW feature, however, all WoW PvE servers had the option to toggle open world PvP for each player if they WANTED to maybe experience some random PvP. Why not make it the user's choice? If you don't like PvP, never turn it on, and if you do, turn it on and enjoy it. As far as I'm concerned, both sides win with this solution.
And just to say, I think something like this should be included WITH something like arena or other PvP games/objectives/scenarios. Why not add the option to PvP anywhere if you want? Could be a relatively simple addition to the game that could add some more excitement and action to the currently rather boring and linear/predictable world.