Hej Tibor,
awesome work and very well thought example. This is a great article.
I would also like to point to a blog post I recently wrote which summarizes the limitations and the benefits of the Resource Governor: http://www.sqlservice.se/sql-server-performance/my-most-un-favourite-things-about-resource-governor/
I am posting this, because I believe it is important for the readers to understand the limitations before engaging the RG. For example, I still think that the greatest flaw of the Resource Governor design is the lack of IO governing capabilities.
Regards,
Feodor