I do a lot of reading where I buy the Kindle book and Audible book and switch back and forth between the two depending on the circumstance of when I'm able to read. It would be neat to tie the read to the two editions and at the end of the read to allow for an estimated percentage. So say I listened to a book 75% of a time on a 400 page book that was 12 hours long my stats would be updated to show 9 hours listen time and 100 pages read.