I have one wish, though it is probably not based on your WhenLast architecture:
I'm one of the rare species of users who switch off their smartphones during night, and sometimes also on daytime.
Additionally, some apps require a reboot to free up memory or really cut their network connection.
Therefore, the power-off-button of my old HTC smartphone was somewhat worn out, i.e. I sometimes needed several approaches to really get the phone off.
So, I searched for an app to shutdown/reboot the phone, but I didn't find any (at least, not for an un-rooted device).
Maybe, this is a challenge for you: providing a shutdown/reboot app which works on normal devices (not rooted).
I don't know, whether this is possible at all. It's just a wish.