I wanted an option for my .ssh/config enabling me to say "use IPv6 for this host". Basically, I looked what command line options -4 and -6 do in ssh and made a config option out of it. Patch at http://www.toppoint.de/~wklaebe/ipv4or6-config-3.5p1.diff
You can do this by explitictly specifying an v4 or v6 addr in "HostName xxx" - I don't think we need another option.
Mass change of RESOLVED bugs to CLOSED