Multiple color palettes
Create custom color pallets and be able to have more than one loaded at a time. Be able to customize names of colors, so we can patch developer terms, like 'Primary Color'. Then, be able to change that color and have it change everywhere. Also, be able to delete a color and if you use that color in your document, you can choose a color to replace it with (just like InDesign).
James Harris commented
The more cues XD takes from InDesign, the better.