I just want to know what's the status of this request?
Since you already added the ability to add an image to a page as an object, i guess it is not really hard to also add the ability to insert a new empty page inside the document.
Deleting should be the same backwards and reordering also.
I would suggest the function to take three arguments:
The Pagenumber a new page is inserted at, (eg. 0 for first page).
The height of the new Site
The width of the new Site
Just the pagenumber (eg. 0 for first Page)
Pagenumber to move (eg 1 for second page)
pagenumber to move at (0 to set it as the first page)