@SAFFLEUR - Thank you!
I will use that, just wanted to see if an option is available in a setting or something not to alter the php and loose customization on updates.
@Alex King - some users use plugins because they are not learning css, filters and API.
I was expecting more like "we will see about that in the development of the plugin" or "we will change some css to fit any colors in the future" not something that sounds like "whatever do what you want if you know how to do it".
Plus, if you check the link you will see that the shortcode creates so bigger spaces between items compared with original thread file and cannot be use at the end of an article or something as it will take so much space and does not look good.
Maybe some "we will learn from the user reports"?