If you are formatting a book or a magazine, page numbers on the right pages are odd (not strange or peculiar but 1, 3, 5, etc.),
and page numbers on the left pages are even. Currently page numbers start on the left and go the opposite, odd number, even number.
This means that if you are formatting a book (I am at the moment), or a magazine, you have to apply the numbers manually. I can do this but it is fraught with potential for error.
Also, if you are formatting a book, page 1 might not come until several pages into the book. Front matter might be in i, ii, iii, format while the numbers for the rest of the book would be 1, 2, 3, 4, etc.
So it would also be helpful (and professional) if the user could determine the starting number instead of having this start automatically on the first page.
