What modifier to choose for clicking on the button?

Question

JavaScript

Possibly a stupid question, though.
I have a "Load More" button that loads the next 10 comments on the page (10 are loaded immediately, and another 10 each time the user clicks the button).
And so I implemented the algorithm: if you click on "Load More" while holding Shift, then all comments are gradually loaded in general (in the same way for 10, but the user no longer needs to click "Load More" every time).
The essence of the question: what modifier key to choose for this purpose? Shift? ctrl? alt? Of course I'll add a hint about this, but I want this behavior to feel jumpy and intuitive. What modifier is usually used for similar purposes on the web or in application software? Like when there is a normal click and, as it were, a "reinforced" click:

Answer 1

If the user clicks Load More for the 3rd time, then you can remove this button and display comments as soon as the user has scrolled to the bottom