I like to use black background with white ink as primary ink (I believe it is good for my oled pixels).
I like to use other colour inks here and there for emphasis.
I would love a feature that turns things as follows

Black background——————> White background
White ink —————————> Black ink
Other colour ink. ——————-> no change

Because that would be the most ideal way to print something
(Of course I can do these with existing features, but it will take a lot of time depending on amount of notes I make)