According to the W3C HTTP page :
Now that both HTTP extensions and HTTP / 1.1 are stable specifications, W3C has closed HTTP activity. The activity has achieved the goals of creating a successful standard that addresses the shortcomings of the earlier HTTP version.
HTTP / 1.1 revision efforts begin at IETF httpbis working group
On the page with the last link there is a mailing list to which you can join, as well as the size of the working group. You may be able to get feedback on the merits of your idea in an abstract expression, but, of course, you will not get hope for a change.
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