Understand that you have to go to the caldav item and click on it before the calendar appears in the calendar app. How do I enable it by default without having to click on it? Any where in the code that I can modify to do so?
Yes, that is the fastest interval that is allowed from Android - therefore its also the minimum that can be set in DAVdroid.
DAVdroid 0.7 allows to set a sync interval in the newly introduced settings dialog!
I have sent the latest beta version via email to check if the problem still occurs with it (there have been related changes).