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I tried this out, with the following observations:
This resistor seems to be involved with ghosting control. Too far one way, and the menu background gets darker with each pointer movement--that is, "white" voltages start to darken the display pixels. Moving the pointer then leaves white ghosts on an increasingly black background. Moving it the other way leaves dark ghosts of the pointer, with the menu background staying white. That is, the inverted "negative" image does not seem to be clearing pixels.
The best setting seems to be just at the point where the cursor leaves no ghost, or just the faintest black ghost. It may take 10 or more pointer moves to see the white ghost, as the background darkens just a bit on each move. This setting does not seem to be too sensitive in terms of resistor position, 1/12 turn is about the threshold for a noticeable difference.
I found that the optimal setting was 1/4 turn counterclockwise from the factory setting. This did result in improved legibility, but noticeably more residual image when the reader was turned off.
BTW, I also took the opportunity to remove the chrome from the top surfaces of the side strips, and paint these black. That chrome is ridiculously bright compared to the black reader and dark display with my visual problems. Scraped it off with a razor blade, stone-age technique but none of the etchants I had would touch it.
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