The original Oasis didn’t have the auto light sensor. I remember thinking this was strange at the time as they were trying to position it as the highest-specced device but they left this off, whereas the Voyage had it.
I’m going to email customer service and ask them to ask the kindle team to make book covers available as a screen saver, maybe some other people would like to join in? I know most of us want this, and we finally got our wish to be able to side-load fonts, so I actually think they may provide cover screensavers at some point. I’m an optimist.
I’m assuming the KOA3 will never be jailbreakable, and the screensaver issue is the only reason I would jailbreak.