We have configured combined pdf using invokeDDx and its working perfectly.
This watch folder will convert multiple PDF's to Single PDF and also converting multiple .PS to single PDF.
Is there is any option in InvokeDDX to fetch "Distiller joboption" so that the .PS should reflect the "joboption".
Not that I am aware of. However, PDF Generator does use the same job options as Acrobat (ES 2.5 uses Acrobat 9 and ADEP uses Acrobat X). See Administrator UI > Settings > PDF Generator > Adobe PDF Settings.