POS files

Wonder if there is a way to view edit and create POS files? I enjoy audio books but when I have a long duration file it takes a long depress on the fastforward button to find a spot in the file. If you knew the timings of a file you could create the time in the POS file or play on another device which allows you to jump directly to a position in the audio file and then save the position from there.
Any thoughts?