Sorry this took so long. As usual, things got inserted ahead of it in the priority queue. :-p
Anyway, here's the client-side sibling proposal to the already-implemented 174. It cuts down time-to-first-byte for HTTP requests by 25 to 50 percent, so long as your SOCKS client (e.g. webfetch, polipo, etc.) is patched to support it. (With that kind of speedup, I think it's worth it.)
Discuss. ;-)
- Ian