The Marks Panel
Since IDImposer models and generates an entire press sheet, it cannot rely on InDesign’s printer marks printing option. So it creates its own marks. The Marks panel allows considerable control over these marks.
Note that if you need to add some other types of marks, such as different color bars, or slug information, it is easy to add them yourself to the press sheet output of IDImposer. Since the output of IDImposer is just a new InDesign document, you can simply Place additional information before printing.