The commenting is great for organizing but it would be very useful to have Note support within Materials and Blueprints.
You could add a note with more detail about specific sections, the math formula, coding issues, etc. just like if you were coding in C++
See Nuke compositing software for example of node notes. Basically like Comment creation but with text area to type into.
Just as a follow up I found this on the Market Place. I have not used it yet but thought I’d post here if others are looking for this functionality.