When linking PDF drawings using the drawing tool, you are currently only allowed to pick a page when linking the file initially or when you relink the file using the drawing manager (edit: or by right clicking the drawing and relinking). Once the drawing is placed, in its settings you can see the linked page of the pdf, however unable to change this. It would be a great addition to have the possibility to just change the page number without having to relink the file.
An additional wish would be about being able to change the pdf all at once using the drawing manager. Currently, there's no way of selecting all the instances (pages) of a linked pdf and relinking them to a new pdf whilst keeping the page numbers. This means that for a 15 page pdf, you will have to relink each drawing and pick page, despite the file being the same.