In reply to Mary Baum.

Members (or any role management plugin for that matter) will allow you to disable page creation/editing for Editors. And, it'll do it by using WP's built-in permissions system.

As for the archive text, one reason you won't see this extra box in most WordPress themes is because it would break the theme review guidelines. It's what's called "theme lock-in". Basically, this means that you're data is tied to a specific theme. So, you're locked into using it forever if you want to access that data.

It's better to use the built-in WP method of handling this -- the category description field -- which many theme authors have been doing for years. There's even a core WP function for archive descriptions now: the_archive_description().