Yes, I have control over that and I could easily implement some changes there.
btw. one user just sent me some ancient com.apple.Labels.plist, it looks like I was almost there with my experiments, I just didn’t understand that the values for RGB colors are not encoded as floats, but as some crazy integers.
Anyways, I could provide that file to you and you could try experimenting with it. Drop me an email to support@binaryage.com and we can follow there.