I had a tough time finding out how to change the HTML content that gets ajax-loaded after you submit an answer (clicking the answer button).
To modify the elements, you can use Jquery!
Example: Hide the comment button only below the submitted answer:
$('.qa-form-tall-button-answer').click( function() {
$(document).ajaxSuccess(function() {
// hide ajax inserted button
$('.qa-a-list-item:first-child .qa-a-item-main .qa-a-item-buttons .qa-form-light-button-comment').hide();
});
});
Hope that helps anybody.