Can you actually call that a bug?

If the expantion is not possible, just scrach that. I'll find different position for it.

Only suggestion I have is for the application layout. Can you move the dates closer up and center them to the respective "boxes". I got used to it already, but at the beginning I was a little confused and thought it's actually the box below which belongs to the date.

Also in the application view. I would change the order of the buttons at the bottom. Month selection > calendar > clear all > save. The month selectin below the calendar and the save at bottom right.

As for the background and icons. I think as you have is ok for general purpose. Only make it customizable, if possible. Like choosing a pic for shift while editting and background for the widget and thats it.

Cheers.