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I noticed on the original v4.3 firmware for the 2-line LCD display, that the tuning action was not symetrical when changing directions when tuning. I looked into the code and it is indeed the case. So I changed to code a bit to make the action symetrical, and I also change a bit the tuning rate steps and also the sensitivity from changing from one step to the other.
At the same time, I didn't like name for the menu selection "Band Select" since it doesn't select specific bands; so I changed the name to "Fast Tune". Also, I felt like the speed was a bit too fast, and the knob was too sensitive to movement (when one went to deselect it, often the frequency would change unintentionally). So I halved the speed and reduced the sensitivity a bit.
I have attatched the code here if anyone wants to try it. I think the tuning works a lot better like this.