My explanation might have been insufficient (wrong). However, that I want to say is not that. RTL support is not that it has been limited in style sheet of theme. So, if you will add RTL option to Q2A core, Q2A should totally support for it. For example, "HTML" tag should have "dir" attribute, and default editor also must support RTL. In other words, RTL support is much bigger work, and V1.7 is not yet support RTL. Anyway, we will need to modify the core on which is fully heard more user's opinion of RTL language area. By the way, WP does not have RTL option. That information is automatically detected from language.