I have added 2 new commands,
/automessage getdelay and
/automessage changedelay.
It's pretty obvious what the commands do. The command
/automessage getdelay shows you what is the current delay set for the messages to be sent at.
With the command
/automessage changedelay you can change the delay without going inside the config.yml file, however you will need to reload the config yourself by using
/automessage reload.