I found myself earlier wanting to update some of my groups and the easiest way for me to do it would be to search for all names with a certain color coding. I have a large tree and to go through one person at a time takes forever. If the "find" function under search people included a simple select all aqua colored names, etc. that would be amazing. Of course that would only include ancestors in that group as other relatives wouldn't be color coded.
I'd like to see more colors, too. I've used all the ones you have.