Is it possible to add session command such as shutdown, restart, log out using HUD or taking advantage of HUD?
I'm waiting for meaningful answers.
You can use HUD to Shut down and log out.
Just press Alt+S and Alt+L. That will allow you to Shutdown, and logout. When you choose shutdown, that will give the option to Reboot.
Shut down and Log out are already available using HUD, just type either of the two and it should display:
If you type Shut down, a dialog window will open which has Reboot / Restart as an option (located on the bottom left corner).
Hope this helps.