iCal default alarm

I have iCal preferences set up to automatically create an Alarm 15 minutes prior to the scheduled event. When an event is set up as "all-day", the alarm will go off at 11:45pm the prior day. This makes total sense on why Apple does this and it is pretty obvious that a user can change the alarm start time. However, if my preferences have been set up that my day starts at 8:00am and ends at 5:00 (my work day), wouldn't it make more sense that an event that you create as "all-day" default to an alarm start time of 8:00am (user start time preference) and not at midnight. Why would I want an alarm to go off at 11:45pm when I'm in bed sleeping? It would make more sense for the alarm to go off at 7:45 am (15 minutes prior to my day start preference).

is there a defaults write com.apple.iCal setting that I can change to make this happen?