With justAdmins you get a powerful addon which manages your admin sounds and messages performantly and fast.
It allows you to set a lot of options by default and each admin you add can have his own settings.
You are allowed to add a unlimited number of new admins.
Sure you can change settings while the server is running, just reload justAdmins.
List of options (snippet of justadmins.ini):

# This option defines whether a default admin is active or not. active = True # onconnect is the sound which will be played by default when an admin connects. Please use a valid sound name from the sounds-category. False means no sound and no messages! onconnect = "normal" # onleave is the sound which will be played by default when an admin disconnects. Please use a valid sound name from the sounds-category. False means no sound and no messages! onleave = "normalleave" # Define how the messages look like on connect. #green, #lightgreen and #default set the color of the chat message. %username% is a placeholder for the admin's name. connectmessage = "#lightgreen[#defaultAdmin#lightgreen]#lightgreen %username% #greenhas joined the server!" # Define how the messages look like on disconnect. #green, #lightgreen and #default set the color of the chat message. %username% is a placeholder for the admin's name. leavemessage = "#lightgreen[#defaultAdmin#lightgreen]#lightgreen %username% #greenhas left the server!" # Display a chat message? chatmessage = True # Display a toptext mesasge (left corner)? topmessage = True # Display a center message? centermessage = True # Display a bottom message (centered)? bottommessage = True