Kindly add a Zoom-to-Fit (Ctl/Cmd + 0) icon at top of PS window that is always visible. See embedded image. Since this command is used so frequently, it will save time by clicking icon instead of using keyboard.
I tried Jeff Arola's suggestion, but I still like the idea of adding a button at the top to fit the image to the screen. When I double-clicked the hand tool as Jeff suggested, the currently active tool (such as lasso) lost focus. I would like to keep the focus on the current tool, and simply click a button.
Jeff Arola, thanks for the suggestion. Yes, I have used scripts and actions. In fact I have one that I wrote the automatically fits the image to screen upon opening the image. I know that I might seem a bit resistant to your idea, but I am aware of the button mode for actions, and do not want to use it. I have quite a few actions and prefer the normal menu-like display of them.