Simple There are no forum templates that we can change
All templates are located under /templates/ folder and are free to edit.
Language under /lang/ folder, language is set under setup_options.php.
All scripts are open source and are free to edit.
Modifying all this you could set up whatever forum you want. Also, I'd recommend to study Manual
more deeply, and take a look on how to find where to edit this or that
What else could we provide?
I am not sure what kind of "direct integration" are you talking about, and why we would need to open some "forum to support RTL languages". This world has hundreds of languages, I only know a couple of them. How could I support something which I don't know? You are welcome to open such forum on your own, if you know the subject.