maybe this book have some information you are looking for. There is a sentence saying: "We are especially pleased to present models
in some less commonly taught languages such as Arabic, Indonesian, Russian, etc..".
Stryker, S. B., & Leaver, B. L. (Eds.). (1997). Content-based instruction in foreign language education: Models and methods. Georgetown University Press.
You have certainly pointed to an interesting question. I believe the work titled: "Roles of Teachers: A case Study Based on Diary of a Language teacher" by Beltran and Inglesa (2001) can be really helpful.
I think it would be useful for you to move your search to the studies that made contrastive analysis between two languages where you can find some studies that might be insightful for your questions. As looking to those studies will give you a clear image about the role that a particular language has in the learning process and its contribution in.
DO you have access to the printed books of the 4th conference of Arabic Language that was held in Dubai last May ? There, you can find plenty of articles written concerning your area of research .