If you want everywhere to be pvp available, in "Scripts/Misc/" open MapDefinitions .cs
In this section just change the map rules.
RegisterMap(0, 0, 0, 7168, 4096, 4, "Felucca", MapRules.FeluccaRules);
RegisterMap(1, 1, 1, 7168, 4096, 0, "Trammel", MapRules.TrammelRules);
RegisterMap(2, 2, 2...