Thank you for your idea. One option for handling this would be to bulk update the features using CSV import. This article explains in more detail.
Given lower historical support for this idea and the option available above, we are unlikely to implement this idea. We hope you can understand.
"just apply a score to the master feature and have all sub-features have the same score, without me having to go in and individually score each sub-feature" This is very common challenge regarding scoring.