This streamlined plug-in serves the simple purpose of adding a system or page break at every rehearsal mark within a selection or the entire score. You may also add a double barline at the break. Check out the youtube demo.
It is a common engraving practice to create breaks at the rehearsal marks in the full score, as it aids in score reading, especially for the conductor. Additionally, many times rehearsal marks denote very clear and, often, even musical sections that are natural candidates for system breaks. Since playable page turns are usually not a concern for a full score, clarity of idea and even layout is more commonly the goal. Sure, you could manually create a break at all of your rehearsal marks, but I wouldn't recommend it on that 200 page opera! Try this fun and fast plugin.