I am not sure about it. Maybe with some cameras you can lock the focus and let the AF system track this spot for you while you recompose. But as I said, I am not sure about it.
Yes, I suppose you could use AI Servi to 'track' to an outer AF point. But that's not focus-recompose, and if you're going to do that, why not just select the outer AF point directly?
Sorry, my english ist quite poor. Maybe I don´t want to say "focus-recompose" but just recomposition. Sometimes you want to recompose to lock the focus and the measured light.
Well, sometimes you just have not the time to do that in single steps. You just may not get the shot.