You can use less $iif's
Code:
menu * {
  $iif($script(who2.mrc),whois/whowas):who2 $iif($menu == $nicklist,$snick)
  $iif(!$script(who2.mrc),Who)
  .$iif($menu == nicklist,whois):whois $$?1="Nick"
  .whowas:whowas $$?="Nick"
}