Color dialog: Black/White/Gray as Basic Colors; hex input
Wouldn't it be sensible (and easy) to add Black, White and several Grays (e.g. 20%/40%/50%/60%/80%) to the list of basic colors in the color selection dialog? Now it's always a hassle using the advanced selection (and almost impossible to get identical gray values).
Speaking of identical values: It would also be very helpful to have ahex input field (including alpha value) on the Advanced tab. Right now, you cannot really reproduce manually selected colors.