I think this should be in the developemt forum but still.
I havnt tested this out but it logically should work. In world in the file client.cpp
If you search for this
if(GetAdmin()>=100) {
cc.gm=1;
}
I dont know how to put a race on a guild specifically you should add
this undearneath of what is about to set everyone to one guild. if(GetAdmin()>=0) {
cc.guildid=1;
}
I know its quite cheap but still

You should then create a guild of your choice with the guildid 1.