Hi BK,
It won't be possible to customize the existing Windows Authentication DLLs, and we don't have any samples for creating your own DLLs to accomplish this.
I'm not familiar with the stored procedures you mentioned, but they do appear to be absent from the standard SP9 database. They seem to have been re-introduced most recently in 11.0 SP12. It may be possible to manually copy over the stored procedure from an SP12 database into your SP9 database, but I can't confirm that the procedure will work as expected by doing this.
Chris
Christopher Gillis
Aras Labs Software Engineer