> I think this is the first time I've seen a 
> specification that causes a proxy to modify 
> a Via that was already in the request.

RFC 3581 performs a similar modification concerning rport.


> So we really want to do this, or do we want 
> the proxy to be adding its own Via with "keep=yes"?

The draft's proposed mechanism allows support and desired use to be
clearly indicated by both sender and receiver at a hop level.  Such a
concept outbound/keepalive stuff was briefly discussed back in 2006:
http://www.ietf.org/mail-archive/web/sip/current/msg13733.html

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