Instead of publishcontent and view_unpublished, consider instead using a module that supports revisions. If you just use the "publish" bit, you need to take a page offline to make moderated changes. With either http://drupal.org/project/revisioning (simpler) or http://drupal.org/project/workbench (full permissions / workflow), you will be able to keep the current approved version of the page online while the latest changes are in moderation.