It's working for me now, but I still haven't tried the framework update...
If you go back through the thread on XDA, there's a step by step to pushing the framework-res thru terminal emulator...that's how I did it on mine.
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Yes. If you actually use the keyboard and slide it closed, the light will remain off until the hardware backlight goes off and then back on.
That's something I've always admired Liquid for, I wish the other roms had a proper backlight. Better than nothing I suppose.