I fixed up some things that didn't work well on my 623. The pagemap icon in the status bar looks better on that device. I also made the Help page only show information on the buttons that the device has. The Next/Prev buttons navigate the panels on the devices without D-pads. I added support for colour on the Colour Lux models (by selecting 24 bit depth in the Display Settings menu for colour (the default), or 8 bit depth if grayscale is preferred). For colourless devices, it's recommended to leave the depth at 8 bits, because the images are smaller and faster to process.
I would appreciate some feedback from anyone with a Colour Lux device. Do colour images show up properly? Does the Configuration page work properly? I guessed that this device uses the same new configuration structures that the latest 622/623 models do, but I don't know that for a fact.
Happy New year everyone!