A simple idea is to send the Bot a message from an administrator account. For example, if the admin sends 'STOP' then the Bot stops sending messages until an admin sends 'START'.
The incoming events to the Bot contains the sender id. The sender id would have to be correlated to a particular administrator id. The only way I have found to get that id for a particular user is to send a message and print out the id. The id is specific for the Bot and user combination. For example, my Bot will send a message to my personal account with this JS line:
sendTextMessage(1073962542672604,fistName + " " + lastName + " " + messageText); // send a message to Matthew directly
Sounds like you have a bot working but if you need more details, have a look at my Bot and source code.
Just for fun, I added this functionality to my Bot. To see details in the node.js implementation, search for the 'isStopped' variable in the app.js script.