It would be great to have precise control over creating guides and to have possibility to change their position ideally through the (numeric) keyboard. I personally use grids very often. Sometimes I need to lock them, copy and past to another page, select and change position, (change color), multi-duplicate some guide with defined distance. Here are some examples of grid layouts (first – more structured book, second – magazine). Guide manager is fine in some situations, but it’s not pleasant for quick adjustments. Opening dialogue window and changing some positions is time consuming process. Also, doing it visually is not good and precise way... Anyway I admire your work.