A couple of nits:
s3: It might be helpful to make the first three paras into a bulleted
list and add an introductory sentence like:
'There are various ways in which an extension to an IETF can be
introduced into the IETF:'
s3, para 3: If my understanding is correct, a document from the normal
Independent Submissions path cannot get directly on to Standards Track
because of the additional requirements for community and IESG review.
This being the case, I think it would be good to make this clear here.
s3, para 6: s/spark hits/idea is formulated/ (phrase is a bit colloquial)
/Elwyn
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