You can script the Fill Factor too :

Neat the end, just after :

SET @PKSQL = @PKSQL + ')'

Add :

DECLARE @ff TinyInt

SELECT @ff = (select A.fill_factor FROM sys.indexes A Where A.name=@PkName)

SET @PKSQL = @PKSQL + ' WITH FILLFACTOR= ' + CAST(@ff as NVARCHAR)