menu * {
  .* Join-part Welcome Notice *
  ..Set Channel: { set %greetchan $?="Enter Channel. i.e. #noumera" | echo -a Greet Channel Is Now Set As %greetchan  }
  ..Enabled: { set %greet on | echo -a Join-part Welcome Notice  in %greetchan is Enabled }
  ..Disabled: { unset %greet | echo -a Join-part Welcome Notice Now Disabled }
}

is better as:

menu * {
  .* Join-part Welcome Notice *
  ..Set Channel: { set %greetchan $?="Enter Channel. i.e. #noumera" | echo -a Greet Channel Is Now Set As %greetchan  }
  ..$iif(%greet,Dis,En) $+ able: { $iif(%greet,unset %greet,set %greet 1) | echo -a Join-part Welcome Notice in %greetchan is $iif(%greet,Dis,En) $+ abled }
}