Allow kids to speed up their suuuppeerr sloooww audio books.
The idea:
While paused, kids could press the right hand button to open the playback menu. Then use the right hand knob to scroll through playback options indicated by user-friendly icons like a speedometer. They could then click the right hand button again to enter setting change mode, and use the right hand knob to adjust the chosen setting. They could then either press play, or use the left hand button to go back and change more.