Is there a key binding to close the actual dialog window with all changes accepted (as if pressing the OK button)? If not, where can I suggest such a feature? E.g. Shift+Enter to accept&close would enormously reduce the number of mouse clicks needed for most workflows.
No idea, I believe it is not actually Gramps that controls that key combination on Windows that is shared in common by other applications also, you can test the key combination in Microsoft Edge to accept the File open dialog….
Highly doubt it will be implemented but you can file a Feature request.
Any particular reason you don’t want to use the standard key combination that is used all over the place outside of Gramps?
In 30+ years, I have never known Alt+o can select&accept the OK button – good to learn something new. I still prefer Shift+Enter though. Of course, I understand it is a matter of personal ergonomics. I am still interested in a workaround to change keybindings. The thread you have linked does not provide a means to this, at least not to my level of understanding. I have submitted a feature request under #0014036.