Well. What I have now is this.
!sht <passphrase> will shut the computer down in xx amout of time.
!shtcancel <passphrase> will cancel the shutdown when it's still within the time limit.
On the pc itself there will be a pop-up with a live counter and a comment message.
There's a preferences screen to choose the delay, comment and passphrase.
The settings are saved in the registry, when for some reason the registry can't be read (and first startup) the preferences screen will come up, and you need to fill all the boxes else it will refuse to close and when pressing cancel or X the script will be disabled.
I don't really feel like adding more features to this script so, whoever wants to continue be my guest.
P.S: Keep your password save, if you think anyone knows it, change it...
The password is saved in the registry as plain text...
IF anyone knows your password and tries to shutdown your computer you can either cancel it with !shtcancel <passphrase> or start->run "shutdown -a"