Thanks for your suggestion.
Will see if more people ask for this.

What about just adding "Yes to all" button, I think Yes / Yes to all, are the most used buttons.

We actually tried hard to make this dialog simple:
https://ux.stackexchange.com/q/35936/30488#38518
To we do not want to re-add the buttons.

Note that you can Shift-click to select Yes to All. So you do not have to use the drop down menu at all.

Is it possible to have a separate button for over writing all files next to YES button? The drop down arrow width is too small and I have to take time and point my mouse pointer to exactly point to the drop down arrow.

I would like it to be
[Yes] [Yes to All] [No] [No to All] [Cancel] [Help]

If not possible at least increase the width of the drop down button area, but I prefer big buttons for these actions.