Only @PowerGlove can confirm this, but I think he won't be able to make that kind of choice. Because to enable this function you need to change the posting system. You have to implement a WYSIWYG.

WYSIWYG editors are interesting because they make the editor look like Word. The problem is that they require javascripts and the like, which could put security at risk. Something nobody wants.

Furthermore, for those who like to use Tor to visit the forum, they would not be able to post or would have several complications.