There are at least a few questions concerning reading as a writer. Would it be useful to make (and apply) a reading-as-a-writer tag?
Example questions (from the first page of the search "reading is:question") might include:
Taking notes while reading
Does reading books help writing skills?
Best Practices To Learn By Reading?
Can I be a good writer without reading a lot?
How do I balance reading time with writing time?
A more general reading tag could include questions like:
Can I improve my beta reading skills to aid a close person's writings?
However, I think "reading as a critic/editor" (including self-criticism/editing) should be distinct from "reading in order to become a better writer", perhaps using a critical-reading tag.