Break At Bars
This plug-in allows users to enter a string of bar numbers to make page breaks or system breaks, or both, allowing you to format your score with a simple list. This is especially helpful when used in conjunction with the Suggest Page Turns plug-in.
Other situations, such as making corrections from a PDF, where it is easiest to put page turns into the Sibelius file before correcting (easier to navigate), and quick formatting, are made a little bit easier.
Once you've tried it, you will probably never start another copy job from handwritten manuscript without this plugin.