Great work.
I've been wondering about the RW pin.
I have a project in development that needs a very fast bar graph. I was going to use the programmable characters to make the last segment variable length to get a one dot wide bar resolution.
There are two, possibly academic questions:
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Is "faster than the eye can see" really true for something like a bar graph?
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Is there any way to, and do you get any advantage out of, trying to sync the value update (which is related to analog sampling in my case) to the refresh cycling of the LCD?
I was thinking of an experiment that involves getting the bar graph working, and then using something like an adjustable sine wave synthed signal to drive it. Walk the frequency up until you can't really get the bar graph to follow the signal. Try that with and without the RW.
I'm in the middle of building a shield for this project and can't try this experiment right now, but I'm planning to. Do you have an old version of the code around I could try?