Code:
On @*:Join:#support: {
  .enable #Oper
  who $nick
}

#Oper off
Raw 352:*: { 
  if (* isin $7) {
    mode #support +v $6
  }
  halt
}
Raw 315:*: {
  .disable #Oper
  halt
}
#Oper end


A more simplistic approach to check if they're an oper is to check their oper host maybe.