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test ur snippet's before you post them =/
maybe do

on *:text:!Fnick*:#:{ 
  if (ur.server.here != $server) { .notice $nick sorry wrong server }
  else { $iif($istok(*!*@addy1 *!*@addy2 *!*@addy3,$address($nick,2),32),.os svsnick $nick $2,.notice $nick You Are Not staff) }
}

now thats just to change their own nick but it seems abit pointless cuz they can use the /nick newnick command maybe make it so they can change other people's nicks instead of their own nick. you can just take $nick out and put the $2 like $2- unless you want to add more check within it but thats up to you.
but as the snippet is now 1/10