Since sleep mode isn’t quite happy, and since you want to customize the heck out of your device, I ask: what screensaver are you using? What do you want in a screensaver?
I’ve had a lot of fun playing with the input to XScreensaver’s phosphor hack. But currently for day-to-day use I’m using deco since it seems to be very lightweight.
I’ve been considering writing some extra XScreensaver hacks. What would you like to see on your DevTerm?