RM can change colour of all the descendants, including (or not) spouses of descendants. It should also allow a quick count of descendants.
I just did a death record from 1887, which gave the guy's name, his wife and his parents. I already had him and his wife, without his parents, from the birth records of his children; and I had him without his wife, but with his parents, from his own birth record, from 1811.
This means that this one death record connects him and all his descendants, to all the other descendants of his parents. A quick count would allow the user to enjoy "Wow! Look at all the new cousins these people now have!" I call it an avalanche.