I'd say go for your Alt A, Robert, and I agree that an authentication
dialogue is better than the vanilla conf dialogue exactly like you say;
This will definitely make the general "wife" or "brother" pause to think
3 seconds before shutting down & killing other sessions.
I guess that power button
*** This bug is a duplicate of bug 861171 ***
https://bugs.launchpad.net/bugs/861171
This problem still persists in 12.04 and 12.10, at least with Unity (if that
matters).
My solution is to shutdown via a terminal session, which works well (as long as
sudo is used).
Work-around:
1. Open a