[Lizard]

Problem 2 is addressed in beta 5, which should be posted soon.
Problem 1 is also addressed in that beta, I believe.

Problem 3: To make Wednesday (for example) a non-working day:
Resize the current work periods to only cover Monday - Tuesday. Then draw new rectangles for Thursday-Friday (click and drag diagonally). Another way to add new work periods is just to make sure the week view pane has focus, and type something like "Th-F 8-12"