One feature I always wanted implemented in whatever CMS I was using was the ability to enter, say, a comma-delimited list of page titles, select the parent page and template to use, and have the CMS generate those pages in one go, instead of having the content editors hit the "New page" button fifty times.
I used to work for a large medical company, and they're departments always had special requirements, with lists of sub-pages to create for their department. Three hours later (it was a Java-applet-based CMS :( ), I was just about done with creating their pages.