I would like to see the ability to select cells by their color, not value. This comes as I have learned of the imputation ability for missing values and JMP will color imputed cells the same color. If the window is closed and 'undo' is no longer available, it would be great to be able to select those cells by color to exclude/undo/etc.
(another way would be to update imputation to make selection easier after the fact, but the suggestion I believe would have use beyond the noted use case).