Create Manually scheduled tasks through PSI

Hello all,

I am creating programmatically tasks in EPM 2010 using PSI (CreateNewAssignmentWithWorkmethod), and it is working sucessfully. However, the new tasks created programmatically are set as automatically scheduled tasks.
To note that the default task mode in new projects under Server Settings for this PWA instance is set to be "Manually Scheduled".

So please if someone can help me set programmatically the tasks mode to Manually scheduled.

The "CreateNewAssignmentWithWork " method doesn't have an argument specifying the task mode.

Any idea???