[not bothering with the spec block 'cos it's not a support request]
I like this feature - it's better than having to fire up the setuptv tool and reconfigure powerscheduler if I decide the machine can switch itself off now (it's a single-seat installation, and I use the machine for plenty of other stuff)
It got me at first though, 'cos I'd like to allow standby between 23:00 and 08:00 - I set this to 23 for the first parameter, 8 for the second, and only figured out when I checked the logs that the first parameter has to be lower than the second. A little flexibility there would be useful.
Using the lastest SVN with the file I posted above you should be able to use 23:00 -> 08:00
Germany