you dont need a new script. just edit the old one. open it in note pad, scroll down a little bit and youll see a box made out of ////'s
at the bottom of this box it says somthing like killshenk whatever
thats not what you need to edit, thats instructions. now scroll down a few more lines and youll see somthing like this:
var doEldritchRun = true;
var doShenkRun = true;
var doPindleRun = true;
var doZombieRun = false;
just change it to this:
var doEldritchRun = false;
var doShenkRun = false;
var doPindleRun = true;
var doZombieRun = false;
there ya go.