A little bit shorter.

on *:QUIT: {
  var %.query.num 1
  while ($query(%.query.num)) {
    if ($nick == $v1) { echo -m $nick $timestamp 4* $nick has quit network stating ( $+ $1- $+ ) }
    inc %.query.num
  }
}
on *:NICK: {
  var %.query.num 1
  while ($query(%.query.num)) {
    if ($newnick == $v1) { echo -m $newnick $timestamp 6* $nick changed their nick to $newnick }
    inc %.query.num
  }
}