When you Ctrl+Click a track to select the color, you have to press enter to close the color menu. Seems like an unnecessary keystroke. Should be like it used to be: click the color, and it selects it.
I know it seems small, but when you select colors on 100 tracks a day, 6 days a week, it makes a huge difference.
Indeed, though the colouring-update has some improvements (sometimes it comes in handy that the color-window stays open) , but it should be better thought out.