I hacked that thing to pieces to get it to do what I wanted to, and by the time I realized that I was doing a great disservice to Europeans by starting the week on Sunday, it was far too late to make it a configurable option.
I'm wondering if you would have better luck with LiveCalendarWidget. The advantages being:
2) You can create your own template. Just copy the LiveCalendarWidget.ss into your theme directory templates/ folder, run a build, and hack away!