Unfortunately this would probably involve changing the Kindle Java framework. Since the source code for that is not released by Amazon, this task would be very hard to accomplish.
The hacks so far (screensaver, fonts, etc) do not directly touch that, they work by changing the Linux filesystem and/or changing/adding some scripts.
Maybe someone with better knowledge on the Kindle internals can discover a clever way to do that, but for me it does not seem to be an easy task.
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