With the lower unit cost of overnight usage it would be good if the control panel was updated so that you could specify an IP address and the time (start and stop) when it would be routable. That way if a large download was run overnight we could have the option to automatically stop it at peak times by effectivly disabling the routing of the IP address. Downloads using bit torrent etc would happly resume when the IP address became routable again.
Possible Solution:
A time limit feature could be added to the control panel that specified when an IP address would be routable.