Where I am there are lots of illegals. Lots. Latinos, Polish, Russians, Asians and just about every country in the world. They are allowed to give talks, go D-t-D, street preach, e-mail bomb people, book studies, just about everything. The only thing I have not heard them being is Elders. The congs need brothers and when they snag one they will take what they can get. If they have to allow him priviledges to keep him happy, they will.
Then again, if he's single, there is always a single American sister to marry him off to to gain him citizenship. My mom told me of 3 weddings she went to last year. All brothers from other countries marrying sisters from the USA. (cough, cough)