I know it is my fault, but I keep forgetting that the big X at the top of the display when watering is running closes the window instead of stopping the watering. If the “stop” button were up near X I feel I would not constantly be making this mistake. (Actually, I don’t make the mistake that often since I don’t manually water that often, probably why I never remember the proper procedure.)
Along with that, I usually forget to to select a zone when I first manually water. Maybe make the selected zones empty by default and pop up a message saying no zone selected. As it is, it takes me a few reflections to realize that I am watering, but not the zone I had intended to start. (Of course, then I press the X and dismiss the window instead of pressing the “stop” button so stopping the “all zone” watering takes a bit longer!)