Congrats on the new BB, I've always liked phpBB2.
Looking at your home page, why don't you institute:
within the BB and link from the home page???
System Outages and General Announcements are both setup with Monarch and a Mailing List. It has worked for years so there is a good deal of history there. For those things the list and Monarch are really a better solution as any retrievals are retrieving static pages which require little CPU and are served fast.
The other things are relatively static and most efficiently served from a static page as well.
PHPBBS actually entails a fair amount ov overhead, especially relative to a static page, but that additional overhead is worthwhile to make dynamic content and interaction possible.