Granting permissions to AD users

Our users are in AD and I started looking to grant permissions to them. What I discovered is that they are not in the users table until they have logged in. Is there any way to pre-populate the users table? If I can just insert them, what fields can be left null and what needs to be populated?

No you can only pre-assign level using groups. Specific device/ports/bills permissions has to be after the login once.