SRAD, or Sergeant's Revenge Anti-Duel Mod, is an extremely small addon that automatically declines duel requests from anyone unless explicitly disabled via slash command. Commands are /sr and /ad. Typing either of those commands simply toggles the mod on and off. It is automatically enabled at every login.
This mod was made entirely from scratch and inspired by a player who continually harassed me by constantly requesting duels and interrupting whatever I was doing at the time. That, and I don't like dueling and it's annoying to have to manually decline them every single time.