Hello @ebud ,
Thank you for your question.
I think it is possible by writing additional Javascript or by editing the JS file of this plugin directly.
There is a topic in this forum that may be helpful.
For example, write it to show a loading icon when clicked, and then hide it when Ajax stops.
$(document).on('click', '.ccc-favorite-post-toggle-button', function(e) {
e.preventDefault(); /* ← Perhaps it is unnecessary because it is duplicative. */
/* your code */
}
Thanks