I'm so sorry for the delay. We had to do some investigation. It seems the older JFBCLogin module had some RTL CSS for it. When we switched to the SCLogin module more than a year ago, those updates were lost. We've simply not had any requests for RTL support since.
We're looking into what it will take to get an RTL CSS file and required changes in the layout files for the 6.2 release due out in September. Unfortunately, there's a lot of work that is required to make the layout RTL while maintaining all the features and looks, but it is on our to-do list.
Again, I'm sorry for not getting back sooner. If you have any questions, please let me know.
Thanks,
Alex