By far the most common operation when developing is the following cycle:

+ make a change to the code

+ build

+ stop currently running version of app

+ run new version

This is what I repeat all day. And it is kind of frustrating because while build and run has good keyboard shortcuts (ctrl+b and ctrl+r) there is no keyboard shortcut to stop currently running app. So I have to mouse around and find the kill button (the app does not always have a close feature that works).

I think developer productivity and UX-stress level could be improved by a significant margin with a simple button "re-run" with keyboard shortcut ctrl+shift+r

It should not be a significant development effort to implement and since it is optional it will not get in the way of existing way.