I believe this isn't a good idea at all.
Spellsofmagic's spell collection was meant to provide tones of different spells to members and allow them to rate them according to what they think of them (the way the were written mostly and at times their content andor their effectiveness).
It would probably spam the website if everyone could comment or leave a feedback.
This is a spell collection, not an open forum. As mentioned before the reason we have the option to rate the spells is to provide a symbolic feedback of each spell and express your general idea(s) about it.
I also doubt it should be given to knowledgeable people only (nor to anybody else) as I believe that would cause superiority issues and it wouldn't really contribute anything to the site - that would be useless and probably very rare.
There's a difference between spell collections to open forums.
Anyway, we dealt with the rating system the way it is - no leaving of feedbacks, and we're totally fine with it, adding a commenting system would be incredibly unnecessary.