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Code:

function ssh_knownhosts_cfg() { # Edit your ~/.ssh/known_hosts

 function __opsEnabled() { # Work on enabled hosts

  enabled=`awk -F' |,' '/^[0-9,a-z,A-Z]/ {print $1}' .ssh/known_hosts`

  select host in menu $enabled ; do [ "$host" == "menu" ] && break

  echo "sed -i \"s|$host|#$host|g\" ~/.ssh/known_hosts"; break

  done; } # end __opsEnabled

 function __opsDisabled() { # Work on disabled hosts

  disabled=`awk -F' |,' '/^#/ {print $1}' .ssh/known_hosts`

  select host in menu $disabled ; do [ "$host" == "menu" ] && break

  echo "sed -i \"s|$host|${host#\#}|g\" ~/.ssh/known_hosts"; break

  done; } # end __opsDisabled

 select type in enabled disabled quit; do

  case "$type" in enabled) __opsEnabled;; disabled) __opsDisabled;;

  quit) return 0;; esac; echo -en "1) enabled\n2) disabled\n3) quit\n"

done; } # end ssh_knownhosts_cfg

- This kludge works only with shells that can handle it and if your known_hosts is at ~/.ssh/known_hosts.
- This can only disable enabled hosts and enable disabled hosts.
- This should cover host lines with and without options.
- Check if my 'awk' and 'sed' needs improvement.
- Remove the echo and escapes from the sed lines.
- Add to your ~/.bashrc (or source a separate alias library, I do).
- Backup your ~/.ssh/known_hosts and don't tell me I didn't warn you.
- Type 'ssh_knownhosts_cfg' to run it.
- If it nukes your known_hosts file or your box you keep the fallout.