Automatically switch user when locked? Or switch user instead of lock

My goal is for vista to only everdisplay one standard 'logon screen' that contains two fields fora username and a password and never hints at what user name(s) are available. I have accomplished this at the welcome screen and logon screen byturning on DontDisplayLastUsername. However the "lock screen" still displays the last user. Obviously I don't want to simply DisableLockWorkstation since the goal here is security.

Can it be done? My ideas:

(1) a registry edit that tells LockWorkstation to not display last username

(2) a registry edit that tellsvista to "switch user" on wake up instead of "locking"

(3) disablingLockWorkstation completely and telling vista to run the contents of the "startup" folder upon wake up