Enable SSH and fire away. You should be able to script it (shutdown and notifications) and even set times via a cronjob. FYI… This units run Debian Lenny Linux distribution, so lots of options, for the advance/willing user.
http://community.wd.com/t5/My-Book-Live/shutdown-vs-poweroff-Command-Line/m-p/519938
“if you just unplug the power it will cause damages?”
It might, hard to tell really, for the most part it will not. Soft shutdown is the recommended action if possible.
