I think it would be beneficial to add a metric that works like DR but for subdomains and subfolders in order to determine the authority and overall power of that specific section of the main domain.
You can call it Sub Domain Rank - SDR.
For example, a site with different language versions can have a DR of 80 overall, but a specific language subfolder or subdomain - fr.example.com or example.com/fr can have an SDR of 23, which allows you to compare your power to local sites that are example.fr lets say.
You can measure the power of each subfolder and subdomain for different purposes, but it would be an useful feature for me :)
Please VOTE UP :) Thanks.