The goal is to give parameters in the PDF export dialog in order to draw crop marks, bleed marks registration marks, page information and a color box. Copying Scribus's PDF export dialog would be a good start. See also Cropmarks extension and discussion for more details and possible features.
- Crop marks (default 7mm and offset)
- Bleed marks (top, bottom, left and right value)
- Registration marks
- Page information
- Colour bars
- Unit selector
Gez: Another interesting feature would be using guides as placeholders for fold or die-punch marks. Aurélio: Use selection bbox to draw markers