Tell the publishers to spend a bit more money and....Oh, wait.
Was thinking of audiobooks on CD. My wife listens to those. How annoying it is to have her listen to the same story over and over if I mistakenly push stop rather than pause.
For a standard downloaded file, I suppose that the only solution would be many smaller files. Otherwise, I do not know of a good technical way to mark placement in an audio file. Smaller files may mean a more cluttered folder, but more convenient searching and playing. So it is with paint, so it must be with audiobooks.