there are some pack's that come like that, for the exact reason. The pack's are made with 2 plugs, and half of the circuits are controlled by one plug, and the other circuits are controlled by the other plug.
also, how often are all your lights at full?
that will cut down a few watts from the plug (acutely, thinking about that, i'm not sure if thats true. If you have a 100
watt light on a
dimmer at 1% is it pulling 1 watt or 100 watts?)