See my reply to your other post. This isn't something that really requires a rule to do. Just make a global_player.pl entry for EVENT_ENTER_WORLD for all characters to do a quest::pvp(on).
You could also make an edit to the source and do a DB query to accomplish the same thing. I do something similar by granting the HoTT leadership AA on new character creation.
https://github.com/N0ctrnl/VAServer/...abase.cpp#L641