Review Session for bookmarks
When driving to work or exercising you can use the existing bookmark feature to mark interesting sequences. That's good and improvement ideas already exist on this (single click to create bookmark for example).
I am missing a feature to easily listen again to all the bookmarks I have set during the daily/weekly commute. Some kind of daily, weekly review as you know from GettingThingsDone. Once I am done for the day I am ready to listen again to the bookmarked sequences, take notes and define actions (inside another system) and then I am going to delete the bookmarks again (as I only use them temporary, until I reviewed them).
It would be great if you can add some kind of "bookmarks playlist" for example as additional playlist (with each sequence of 10-20seconds for each bookmark). Once the review of the sequence is marked as completed the bookmark is removed from the playlist - otherwise it remains and new entries will be added to the list when bookmarked.