Shutdown Password

Hey,
I just experienced a situation that lighted up a led in my brain.
What about a password request to shutdown the server ?
So if someone finds the system open in a browser and has no permission to activate/deactivate , he would be requested for a password to take down server.

Ideally, a different password from the main ( the one to access the server) would be perfect or this
I think it could be useful, because this system could be used also as alarm system

My suggestion was specific on admin user.
Here's a common situation:
I'm the admn of my server. I access my system from my workplace. I need to go to toilet/to another office/ etc. My browser stays open on my system. Someone could access my server with admin rights. Yeah , i know , i should never leave my laptop accessible to someone else than me, but if you work or have worked in an office, you know it happens everyday

I used this situation as a main example of my suggestion