I don't follow what you mean here?

Let me explain. What I suggest is that below the word "Duplicate" with its marker on the left, there should be a new text, for example, "Zero point," also with a checkbox. When checked, the position on the mirror axis would automatically be zeroed. This saves the need to drag to mark and type the number 0. The mirror duplication process could then be performed using only the mouse.

We're not big on adding additional elements to the user interface in order to save you from a click or key stroke. In this case keyboard focus is already on the input, all you need is to type "0".

Sorry...

I insist, these options can be saved. Whenever you open the mirror, they will already be pre-selected!

But okay, do what's best.