@etardiff this is a very interesting modification, thank you! I would have to think if I need it, but it seems a very logical extension of my initial idea. Two UX details that would make it even better:
Not copying the value on the fist click of the two clicks to edit, in case user wants to paste a previously copied content into the edited cell. This seem difficult with the current design, there would probably have to be a second button to explicitly edit.
Click outside of the edited field also exits edit mode, just as Esc.
Just thinking loud. I’m not entirely sure that these are good ideas or worth implementing. The beauty of the plugin and your modification is that they are very simple and lightweight.