Great idea!
I would consider buying this for bitcoin if you could add a scheduler so we could start/stop the miners at certain times of the day, for example when the computers are in use.
That's a good idea. I'll see what I can come up with, but no need to 'buy' it. It's free

I actually started programming a service called
http://minermanager.com that offered a similar thing. An application installed on each mining machine that you could schedule/control from the website. I didn't finish it though.