Yeah, I know. Bummer.
I did a workaround and made a Python script where you can specify the names of IVS rules you want the script to enable/disable. I use the script with the Domoticz home automation platform, so I can turn an arbitrary number of IVS rules on or off with the click of a button within Domoticz.
Can share if anyone’s interested. No rocket science but requires basic Linux/Python/Domoticz knowledge to set up. The Python script can be used standalone on any platform to enable/disable the rules though, Domoticz just acts as the triggering interface.
Edit: I tried to snoop the HTTP traffic to figure out how the camera sends commands from the web interface, but the JavaScript mess that Dahua implements just wasn’t worth the time.