Re A) You need not to create another task, just reuse the task in the user profile setting(<filename>.fsf).
Re B) The command line shoud b /Sync:S(<task-number>). Thank you point out this mistake, I have fixed the command line in the QnA page.
And we have just fixed a bug that may cause the temporary file remains, please try the new 6.2.12 at the download page. May be you can use the real-time sync, and no need the logoff script now