yelow79, your script can be improved a bit so you can add more than one alternative nickname. You don't need to put the control code for color number 3 but simple use echo 3 -a to do the same thing. Also, a delete feature would have been nice:

menu status,menubar,channel,query {
  Nick Alert 
  .set $iif(%alert == on, OFF, ON ) :{
    set %alert $iif(%alert == on,off,on) 
    echo 3 -a nickalert is now turned %alert
  }
  -
  .set alt. trigger {
    set %altnick $addtok(%altnick,$$?"enter an alernative nickname here:",124) 
    echo 3 -a your alternative nick $! has been added to my alternative list!
  }
  -
  .del alt. trigger {
    if ($istok(%altnick,$$?"Enter an alernative nickname to delete:",124)) {
      set %altnick $remtok(%altnick,$!,1,124)
      echo 3 -a your alternative nick $! has been deleted successfully!
    }
    else {
      $input(The alternative nickname $! is either deleted or doesn't exist in my alterntive nick list.,o)
    }
  }
}
on $*:text:$(/\b(\Q $+ $me $+ \E|\Q $+ %altnick $+ \E)\b/iS):#: {
  if (%alert == on) && ($active != $chan) {
    echo -a 4[ $+ $time $+ ] $nick said your name in $chan $+ : $1-
    beep 3
  }
}

Now, you can have as many alternative nicknames added as you wish. The %altnick is added as such: > %altnick nick1|nick2|nick3|nick4|etc..,which will simulate regex's OR operator.
I also have an popup box check to warn if an alternative nickname to be deleted exists or not.