I realize that having to log in every time one visits is less convenient than our last forum, but unfortunately none of the tweaks I've made to the phpBB settings have gotten the "Remember me" option to stick from one session to another. Therefore, I've decided to try creating a single forum which is publicly visible, so that people can post things that will more easily get others' attention. Almost like a News Box that everyone can contribute and respond to.
Right now I'm thinking that topics will eventually be moved from here into the appropriate/relevant private forum once they're ready to be archived, but we'll play it by ear and see how things work out.
If anyone has any other suggestions regarding forum settings or structure, please chime in!