Better UX after submitting comment (AJAX loading)

Thanks again for amazing comment plugin, guys! Really liked it and I use it on my various wp-based projects. I found out a common problem, reported by many users. When they submit a comment via wpDiscuz, many of them don’t see the ajax-loader icon (animation) in the right top corner. So they don’t know if the comment form working, submitting or not. Some of them give up, some of them try to send it many times, before realize it’s been posted already.

Is there any way to improve this? Like making the form in disabled state, or making animation icon more visible?

Or any suggestion for customize this? Thanks!

The page I need help with: [log in to see the link]