Hi Andee,
No, we haven’t considered adding this measure or a visualization thereof. I think the wikipedia entry is helpful:
The QCR is not commonly used in the practice of statistics; rather, it is a useful tool in statistics education because it can be used as an intermediate step in the development of Pearson’s correlation coefficient.[1]
I can see how it would be useful if one’s goal is to understand the meaning of the correlation coefficient as a numerical measure. You say that you think that not requiring the line makes it more intuitive. What are the conceptual difficulties you expect that it would help with?
Thanks for the question,
Bill