I don't know hot to change it, but you can try use this script at rathena/npc/custom/warper.txt
you can edit the value at this point
OnInit:
.Satan_Morocc = true; // false will enable moc_fild 4,5,6,8,9,10,14,15 while disable moc_fild 20,21,22 Default is true.
.OnlyFirstFld = false; // true will teleport to the first level of the Fields Default is false.
.OnlyFirstDun = false; // true will teleport to the first level of the Dungeons Default is false.