doc.pages.item(i).resize(CoordinateSpaces.SPREAD_COORDINATES, AnchorPoint.BOTTOM_LEFT_ANCHOR, ResizeMethods.REPLACING_CURRENT_DIMENSIONS_WITH,[doc.documentPreferences.pageWidth*factor, doc.documentPreferences.pageHeight]); 

var i = 0, 
    factor = 1.3; 
    doc = app.documents.add(); 
     
doc.spreads.firstItem().allowPageShuffle = false; 
doc.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.POINTS; 
doc.viewPreferences.verticalMeasurementUnits = MeasurementUnits.POINTS; 
 
for (i = 0; i < 3; i++) 
    doc.pages.add(); 
 
doc.pages.item(0).resize(CoordinateSpaces.SPREAD_COORDINATES, AnchorPoint.BOTTOM_LEFT_ANCHOR, ResizeMethods.REPLACING_CURRENT_DIMENSIONS_WITH,[doc.documentPreferences.pageWidth*factor, doc.documentPreferences.pageHeight]); 
 
doc.pages.item(2).resize(CoordinateSpaces.SPREAD_COORDINATES, AnchorPoint.BOTTOM_LEFT_ANCHOR, ResizeMethods.REPLACING_CURRENT_DIMENSIONS_WITH,[doc.documentPreferences.pageWidth*factor, doc.documentPreferences.pageHeight]); 

var doc = app.documents[0]; 
var facingPages = doc.documentPreferences.facingPages; 
doc.documentPreferences.facingPages = true ; 
 
var factor = 1.3;  
 
doc.viewPreferences.horizontalMeasurementUnits = MeasurementUnits.POINTS ;  
doc.viewPreferences.verticalMeasurementUnits = MeasurementUnits.POINTS ;  
  
 
doc.pages[0].resize 
( 
	CoordinateSpaces.SPREAD_COORDINATES ,  
	AnchorPoint.BOTTOM_LEFT_ANCHOR ,  
	ResizeMethods.REPLACING_CURRENT_DIMENSIONS_WITH , 
	[  
		doc.documentPreferences.pageWidth*factor ,  
		doc.documentPreferences.pageHeight 
	] 
);  
      
doc.pages[2].resize 
( 
	CoordinateSpaces.SPREAD_COORDINATES ,  
	AnchorPoint.BOTTOM_LEFT_ANCHOR ,  
	ResizeMethods.REPLACING_CURRENT_DIMENSIONS_WITH , 
	[ 
		doc.documentPreferences.pageWidth*factor ,  
		doc.documentPreferences.pageHeight 
	] 
);  
 
doc.documentPreferences.facingPages = facingPages ; 

var doc = app.activeDocument;   
doc.spreads.firstItem().allowPageShuffle = false;  
 
doc.documentPreferences.facingPages = true; // keine Seitenüberlappung 
//~ doc.documentPreferences.facingPages = false; // ggf. Überlappung von benachbarten Seiten 
 
while (doc.pages.length < 4) 
    doc.pages.add(); 
	 
var pg = doc.pages.item(1);   
var tf_matrix = app.transformationMatrices.add({horizontalScaleFactor:1.3});   
 
pg.transform( 
    CoordinateSpaces.SPREAD_COORDINATES,  
    AnchorPoint.CENTER_ANCHOR,  
    tf_matrix 
);