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AnotherCat - I hope your not suggesting replacing the near invisible red dots with lime green dots.
If the current cell in the spell check word list is to be differentiated, then I suggest it be done in the same way that the current cell in the calibre book list is differentiated - make the background colour of the current cell the same darker blue. A means to move the current cell from the keyboard is also needed - maybe the arrow keys could be used, just as they can be used in the book list.
BR