This would be helpful to me, as I use autoresponse often.
This may be a stop gap for you.
If you simply wanted to set/unset it then you can make the menu item a floater.. More on this after.
If you're wanting to change the actual message then this won;t help help you... however something that's in the next release is the setting of debugs via local chat ...which also means you can creat a gesture for that... which means it can be trigger with a keyword ...which also means it can be hot keyed. ...so Pressing F1 for example, can toggle your automessage status, or change what it says etc, neat huh.
Okay so to make the Autoreponse toggler a floater (and any other menu item) Just click the double horizontal lines at the top of that menu's.. menu
Attached a video demonstrating this.