It would be a good idea to have keyboard shortcuts for labels. Since you work with many different apps, perhaps, it would be advantageous to be able to customize those shortcuts to jive with the main app used, for example, I use CaptureOne and use the "6" key for red, "7" key for yellow and "8" for green. Each means something for my workflow within CaptureOne. Keys one thru 5 are used for star ratings.