you can just simply modify the source part...
change the coordinate here
src/map/atcommand.c#L1739
{ MAP_PRONTERA, 156, 191 }, // 0=Prontera
then change edit this line
src/map/atcommand.c#L1816
if (strncmp(map_name, "prontera", 3) == 0 || strncmp(map_name, "home", 3) == 0) {