Hi Everyone,
May sound like a silly question, but is there anyway I can gracefully shutdown my rig from SMOS? I've only seem 'reboot' option so far and have been shutting down my rig when required by just switching off the PSU.
Thanks!

You mean from the web interface? No.
You can ssh to your machine and execute the following: shutdown -h now
Pressing the power button once will initiate the shutdown process as well.