associate color labels with tags
Allow user-defined tags to be associated with the existing color labels.
This will make it possible to quickly set common tags and allow the user to make their implicit meaning of colour labels explicit.
A user (say, me) uses the blue label to mark those images that are ready for publication on facebook. With the new feature, I can associate "blue" with the tag facebook and can easily spot the corresponding images in the lighttable.
I also associate yellow, red and green with my cat's names, which now allows me to tag the individual cats in my images with a keystroke as I am culling the images. (Of course I take cat pictures. What else is darktable for? :-)