Calendar default values

I need the calendar-app to show some defaultvalues on creating a new event.
I managed this for the summary and the description with adding
to icalFactory.js
But I need to unset “allDay” and the starttime to 8:00 and the endtime to 12:00

Maybe someone can help me.
It would be perfect if I could define that new users’ setting is to use the sidebar-Editor and not the simple one.

Thanks for reading