Suggestion:  I would like to be able to specify the function of the big Shutdown button.  What I usually do is Lock, but when it's late and I'm tired, occasionally I have clicked on the big Shutdown button instead of the little arrow for the menu.  This is a pain because then I have to reboot.  Even if I cancel the shutdown, some unknown number of programs have already terminated.

Another possibility would be to ask for confirmation of things like Shutdown, Restart, and Logoff, as XP used to do.