I agree with the latest comments. Luckily the firmware is uprageable, so all these details can be added in the future FW versions. The last one (3.04) is quite good, but there's always room for improvement.
The two LEDs at the bottom can be used to show charging status.
Unfortunately, it seems that the power-saving feature was the last part of the development process, maybe even following it, resulting in some poor decisions which were adressed with the netready upgrade.
It does seem a bit odd you can't turn it off, but I've gotten used to it so much, that I don't even unlock the device, and start the dive with the device out of the box, as it wakes up automatically on pressure change. Again, with an upgradeable software, all this can be configurable, and I'm sure a time will come, when you'll be able to make your own settings in the Dive organizer, and have it compile your own firmware.
I bought a USB solar charger that's basically a battery that can be pre-charged via a USB port, or with the sun, and I use it as a backup to charge my icon when I don't have a power outlet nearby. It's not gonna charge the icon 100%, but enough for a dive. And while I'm diving it's charging out in the sun.
@Hatul
"net ready" is a concept developed by Mares that some day (soon?), your equipment will be able to communicate with the icon being the brains of the operation. Parts of your equipment will be able to exchange different type of information and feed it into the icon for display. What info? Let your immagination run wild. When during the dive you inflated your BCD? How much air did you put in it, and how much you have at the moment. The body temperature in your suit. If you drop a part of your equipment it goes out of RF range, and you get an alarm. The GPS reciever on your buoy can relay its coordinates to your icon, and show your location on a map. And then all this for your buddy and/or your dive group if you're a dive master...