When you call a php script, variables can be passed to the page through the url, as in url?var=this&var=that... set the appropriate variable to the appropriate value (sorry, I forgot what it was, it's late) in the URL, or just mess with it on your own board. Either way, global announcement has to go a little bit below things like, say, the install script, so I'm afraid some of the streamlining type features may not even make it into 2.2. (Not that I'm in any way qualified to say, nor should you take my word as fact, educated guess, or even remotely informed)
I am no longer doing any phpBB related projects. Except Vertex, which is only a front for Sphereal.