I'd like to see the abiltiy to change the color of:
Greek Font
Hebrew
Transliterated Greek
Transliterated Hebrew
Morpo data
English Gloss
etc....
I used this feature frequently in V3 because on densly packed interlinears; it's easier to make out details and keep your place while you read than when there is a huge block of black on white text.
Here is a comparison colored on the left; B/W on the right.
