It would be good if the user could set how much time (in seconds) jumps when each of the 4 seek buttons are pressed.
Something like this in settings (as you can see, I'm not sure how to properly name the buttons):
Top-left seek button jump: [options]
2nd left seek button jump: [options]
Top-right seek button jump: [options]
2nd right seek button jump: [options]
and [options] is a list of the following: 5, 15, 30, 60, 90, 120, 180