All in all, my personal recommendations would be: -no seconds bar at all (but you already pointed out that you can remove it from the (future) themes menu)
- instead of an 'exit' button (at the lower right of the screen), use an 'alarms' button. And from the alarms screen one can get to the settings screen. But you already pointed out that you want an exit button, so new users won't feel 'locked in'. I (still) say that using the hardware on/off buttons is intuitive and feels 'natural' if you want to close the program.
- leave the finger gestures: they are so cool!