Create OAuth users via API

I currently have my OAuth external authentication created and working. I would like to pre-populate the Telligent membership with all the users in my external authentication so I can populate all their community details and link their account to forum posts we are importing from vBulletin.

When I create a user via the RESTful API /api.ashx/v2/users.json, the connection happens, but the user is required to enter a username/password that I entered via the API. Is there a flag I can use to remove the local username/password requirement? Thus basically pre-creating the OAuth users.