I decided to stop developling MyBB addons. You can find details here:
lukasamd/MyBB-View_Unread_posts#25
This plugin provide very fast quote option - select text and click button!ย
Quote has never been so easy!
Additional fast quote button provide super-fast option to quote selected text. It supports whole post (just click it), or only selected area. It also supports mycode/bbcode in quoted posts.
Admin can set button CSS style in plugin settings. Form name, field name and alt/title text can be also set.